2.9999*3+ 10 1* 1 1*( 10 1-92)

3.(23/4-3/4)*(3*6+2)

4.3/7 × 49/9 - 4/3

5.8/9 × 15/36 + 1/27

6. 12× 5/6 – 2/9 ×3

7.8× 5/4 + 1/4

8.6÷ 3/8 – 3/8 ÷6

9.4/7 × 5/9 + 3/7 × 5/9

10.5/2 -( 3/2 + 4/5 ) 4/9×3= 5÷ 1/3 = 1/2÷ 1/3 =

2 1/25÷42= 4/5×3/4 = 8.7×0.2=

4×0.25= 1/7× 14= 2/3÷5/6=

1.25×8= 3/5÷5/8= 6/7×3/2=

6×8.8= 4/ 1 1÷4= 4/9×3/8=

5/3÷5= 0÷8/3= 4/7-2/3=

2/7×2= 4 1/ 12×4= 4÷3/ 16=

12÷9/4= 75/8 ÷5= 12× 16/9=

2/3×3= 8÷9/4 = 5/3÷3/5 =

4/5×5/8= 7/9×9/7= 2.64+3.6=

2.4×50= 3500÷70= 2050-298=

2+7÷9= 0.3÷3%= 286+ 198=

3 14-202= 526+30 1= 223-99=

1/2×3/5= 1.89÷ 100= 0.82+0.08=

73× 1= 0.63× 10= 4÷ 10=

17÷ 1000= 0.56+0.4= 1.25× 100=

5.6+99= 43×63/2 1= 100÷25=

1-0.93= 90-0.9= 18.3× 1/3=

794- 198= 68×25= 43.3-63/2 1 =

72× 125= 300 1- 1998= 23/5×5/6 =

20/3× 12= 1/2- 1/6= 30.25×4/5=

5/6- 1/2= 1/2× 1/5=

1 1.7/8 + ( 1/8 + 1/9 )

12.9 × 5/6 + 5/6

13.3/4 × 8/9 - 1/3

14.7 × 5/49 + 3/ 14

15.6 ×( 1/2 + 2/3 )

16.8 × 4/5 + 8 × 1 1/5

17.3 1 × 5/6 – 5/6

18.9/7 - ( 2/7 – 10/2 1 )

19.5/9 × 18 – 14 × 2/7

20.4/5 × 25/ 16 + 2/3 × 3/4

2 1. 14 × 8/7 – 5/6 × 12/ 15

22. 17/32 – 3/4 × 9/24

23.3 × 2/9 + 1/3

24.5/7 × 3/25 + 3/7

25.3/ 14 ×× 2/3 + 1/6

26. 1/5 × 2/3 + 5/6

27.9/22 + 1/ 1 1 ÷ 1/2

28.5/3 × 1 1/5 + 4/3

29.45 × 2/3 + 1/3 × 15

30.7/ 19 + 12/ 19 × 5/6

3 1. 1/4 + 3/4 ÷ 2/3

32.8/7 × 2 1/ 16 + 1/2

33. 10 1 × 1/5 – 1/5 × 2 1

34.50+ 160÷40

35. 120- 144÷ 18+35

36.347+45×2-4 160÷52

37(58+37)÷(64-9×5)

38.95÷(64-45)

39. 178- 145÷5×6+42

40.8 12-700÷(9+3 1× 1 1) 1.3/7 × 49/9 - 4/3

2.8/9 × 15/36 + 1/27

3. 12× 5/6 – 2/9 ×3

4.8× 5/4 + 1/4

5.6÷ 3/8 – 3/8 ÷6

6.4/7 × 5/9 + 3/7 × 5/9

7.5/2 -( 3/2 + 4/5 )

8.7/8 + ( 1/8 + 1/9 )

9.9 × 5/6 + 5/6

10.3/4 × 8/9 - 1/3

1 1.7 × 5/49 + 3/ 14

12.6 ×( 1/2 + 2/3 )

13.8 × 4/5 + 8 × 1 1/5

14.3 1 × 5/6 – 5/6

15.9/7 - ( 2/7 – 10/2 1 )

16.5/9 × 18 – 14 × 2/7

17.4/5 × 25/ 16 + 2/3 × 3/4

18. 14 × 8/7 – 5/6 × 12/ 15

19. 17/32 – 3/4 × 9/24

20.3 × 2/9 + 1/3

2 1.5/7 × 3/25 + 3/7

22.3/ 14 ×× 2/3 + 1/6

23. 1/5 × 2/3 + 5/6

24.9/22 + 1/ 1 1 ÷ 1/2

25.5/3 × 1 1/5 + 4/3

26.45 × 2/3 + 1/3 × 15

27.7/ 19 + 12/ 19 × 5/6

28. 1/4 + 3/4 ÷ 2/3

29.8/7 × 2 1/ 16 + 1/2

30. 10 1 × 1/5 – 1/5 × 2 1

3 1.50+ 160÷40 (58+370)÷(64-45)

32. 120- 144÷ 18+35

33.347+45×2-4 160÷52

34 (58+37)÷(64-9×5)

35.95÷(64-45)

36. 178- 145÷5×6+42 420+580-64×2 1÷28

37.8 12-700÷(9+3 1× 1 1)

38.85+ 14×( 14+208÷26)

39.(284+ 16)×(5 12-8208÷ 18)

40. 120-36×4÷ 18+35

4 1.(58+37)÷(64-9×5)

42.( 6.8-6.8×0.55)÷8.5

43.0. 12× 4.8÷0. 12×4.8

44.(3.2× 1.5+2.5)÷ 1.6

45.6- 1.6÷4= 5.38+7.85-5.37

46.7.2÷0.8- 1.2×5

47.6.5×(4.8- 1.2×4)

48. 1 0. 15- 10.75×0.4-5.7

49.5.8×(3.87-0. 13)+4.2×3.74

50.32.52-(6+9.728÷3.2)×2.5

1.(1/69+2/7 1) times 23+25 divided by 71.

=23/69+46/7 1+25/7 1

= 1/3+71/71=1and1/3.

2.( 1+ 1/2) times (1-kloc-0//2) times (1+ 1/3) times (1-kloc)

=3/2* 1/2*4/3*2/3*5/4*...... 10/9*8/9

= 1/2* 10/9

= 10/ 18.

3. 1/2 times 3+ 1/3 times 4+...+119 times 20.

4. 1/27+505/2727+ 13 13 13/272727

5. 100-98+96-94+....+4-2

1. 125*3+ 125*5+25*3+25

2.9999*3+ 10 1* 1 1*( 10 1-92)

3.(23/4-3/4)*(3*6+2)

4.3/7 × 49/9 - 4/3

5.8/9 × 15/36 + 1/27

6. 12× 5/6 – 2/9 ×3

7.8× 5/4 + 1/4

8.6÷ 3/8 – 3/8 ÷6

9.4/7 × 5/9 + 3/7 × 5/9

10.5/2 -( 3/2 + 4/5 )

1 1.7/8 + ( 1/8 + 1/9 )

12.9 × 5/6 + 5/6

13.3/4 × 8/9 - 1/3

14.7 × 5/49 + 3/ 14

15.6 ×( 1/2 + 2/3 )

16.8 × 4/5 + 8 × 1 1/5

17.3 1 × 5/6 – 5/6

18.9/7 - ( 2/7 – 10/2 1 )

19.5/9 × 18 – 14 × 2/7

20.4/5 × 25/ 16 + 2/3 × 3/4

2 1. 14 × 8/7 – 5/6 × 12/ 15

22. 17/32 – 3/4 × 9/24

23.3 × 2/9 + 1/3

24.5/7 × 3/25 + 3/7

25.3/ 14 ×× 2/3 + 1/6

26. 1/5 × 2/3 + 5/6

27.9/22 + 1/ 1 1 ÷ 1/2

28.5/3 × 1 1/5 + 4/3

29.45 × 2/3 + 1/3 × 15

30.7/ 19 + 12/ 19 × 5/6

3 1. 1/4 + 3/4 ÷ 2/3

32.8/7 × 2 1/ 16 + 1/2

33. 10 1 × 1/5 – 1/5 × 2 1

34.50+ 160÷40

35. 120- 144÷ 18+35

36.347+45×2-4 160÷52

37(58+37)÷(64-9×5)

38.95÷(64-45)

39. 178- 145÷5×6+42

40.8 12-700÷(9+3 1× 1 1)

4 1.85+ 14×( 14+208÷26)

43. 120-36×4÷ 18+35

44.(58+37)÷(64-9×5)

45.(6.8-6.8×0.55)÷8.5

46.0. 12× 4.8÷0. 12×4.8

47.(3.2× 1.5+2.5)÷ 1.6

48.6- 1.6÷4= 5.38+7.85-5.37=

49.7.2÷0.8- 1.2×5= 6- 1. 19×3-0.43=

50.6.5×(4.8- 1.2×4)=

5 1.5.8×(3.87-0. 13)+4.2×3.74

52.32.52-(6+9.728÷3.2)×2.5

53.[(7. 1-5.6)×0.9- 1. 15] ÷2.5

54.5.4÷[2.6×(3.7-2.9)+0.62]

55. 12×6÷( 12-7.2)-6

56. 12×6÷7.2-6

57.0.68× 1.9+0.32× 1.9

58.58+370)÷(64-45)

59.420+580-64×2 1÷28

60. 136+6×(65-345÷23)

15- 10.75×0.4-5.7

62. 18. 1+(3-0.299÷0.23)× 1

63.(6.8-6.8×0.55)÷8.5

64.0. 12× 4.8÷0. 12×4.8

65.(3.2× 1.5+2.5)÷ 1.6

66.3.2×6+( 1.5+2.5)÷ 1.6

67.0.68× 1.9+0.32× 1.9

68. 10. 15- 10.75×0.4-5.7

69.5.8×(3.87-0. 13)+4.2×3.74

70.32.52-(6+9.728÷3.2)×2.5

7 1.[(7. 1-5.6)×0.9- 1. 15] ÷2.5

72.5.4÷[2.6×(3.7-2.9)+0.62]

73. 12×6÷( 12-7.2)-6

74. 12×6÷7.2-6

75.33.02-( 148.4-90.85)÷2.5

1) 76.(25%-695%- 12%)*36

77./4*3/5+3/4*2/5

78. 1- 1/4+8/9/7/9

79.+ 1/6/3/24+2/2 1

80./ 15*3/5

8 1.3/4/9/ 10- 1/6

82./3+ 1/2)/5/6- 1/3]/ 1/7

83./5+3/5/2+3/4

84.(2-2/3/ 1/2)]*2/5

85.+5268.32-2569

86.3+456-52*8

87.5%+6325

88./2+ 1/3+ 1/4

2) 89+456-78

3) 5%+.3/7 × 49/9 - 4/3

4) 9 × 15/36 + 1/27

5) 2× 5/6 – 2/9 ×3

6) 3× 5/4 + 1/4

7) 94÷ 3/8 – 3/8 ÷6

8) 95/7 × 5/9 + 3/7 × 5/9

9) 6/2 -( 3/2 + 4/5 )

10) 8 + ( 1/8 + 1/9 )

1 1) 8 × 5/6 + 5/6

12) 1/4 × 8/9 - 1/3

13) 10 × 5/49 + 3/ 14

14) 1.5 ×( 1/2 + 2/3 )

15) 2/9 × 4/5 + 8 × 1 1/5

16) 3. 1 × 5/6 – 5/6

17) 4/7 - ( 2/7 – 10/2 1 )

18) 19 × 18 – 14 × 2/7

19) 5 × 25/ 16 + 2/3 × 3/4

20) 4 × 8/7 – 5/6 × 12/ 15

2 1) 7/32 – 3/4 × 9/24

22) 1、 2/3÷ 1/2- 1/4×2/5

2、 2-6/ 13÷9/26-2/3

3、 2/9+ 1/2÷4/5+3/8

4、 10÷5/9+ 1/6×4

5、 1/2×2/5+9/ 10÷9/20

6、 5/9×3/ 10+2/7÷2/5

7、 1/2+ 1/4×4/5- 1/8

8、 3/4×5/7×4/3- 1/2

9、 23-8/9× 1/27÷ 1/27

10、 8×5/6+2/5÷4

1 1、 1/2+3/4×5/ 12×4/5

12、 8/9×3/4-3/8÷3/4

13、 5/8÷5/4+3/23÷9/ 1 1

23) 1.2×2.5+0.8×2.5

24) 8.9× 1.25-0.9× 1.25

25) 12.5×7.4×0.8

26) 9.9×6.4-(2.5+0.24)(27) 6.5×9.5+6.5×0.5

0.35× 1.6+0.35×3.4

0.25×8.6×4

6.72-3.28- 1.72

0.45+6.37+4.55

5.4+6.9×3-(25-2.5)2×4 1846-620-380

4.8×46+4.8×54

0.8+0.8×2.5

1.25×3.6×8×2.5- 12.5×2.4

28× 12.5- 12.5×20

23.65-(3.07+3.65)

(4+0.4×0.25)8×7× 1.25

1.65×99+ 1.65

27.85-(7.85+3.4)

48× 1.25+50× 1.25×0.2×8

7.8×9.9+0.78

( 10 10+309+4+68 1+6)× 12

3×9 146×782×6×854

5. 15×7/8+6. 1-0.60625

1.3/7 × 49/9 - 4/3

2.8/9 × 15/36 + 1/27

3. 12× 5/6 – 2/9 ×3

4.8× 5/4 + 1/4

5.6÷ 3/8 – 3/8 ÷6

6.4/7 × 5/9 + 3/7 × 5/9

7.5/2 -( 3/2 + 4/5 )

8.7/8 + ( 1/8 + 1/9 )

9.9 × 5/6 + 5/6

10.3/4 × 8/9 - 1/3

1 1.7 × 5/49 + 3/ 14

12.6 ×( 1/2 + 2/3 )

13.8 × 4/5 + 8 × 1 1/5

14.3 1 × 5/6 – 5/6

15.9/7 - ( 2/7 – 10/2 1 )

16.5/9 × 18 – 14 × 2/7

17.4/5 × 25/ 16 + 2/3 × 3/4

18. 14 × 8/7 – 5/6 × 12/ 15

19. 17/32 – 3/4 × 9/24

20.3 × 2/9 + 1/3

2 1.5/7 × 3/25 + 3/7

22.3/ 14 × 2/3 + 1/6

23. 1/5 × 2/3 + 5/6

24.9/22 + 1/ 1 1 ÷ 1/2

25.5/3 × 1 1/5 + 4/3

26.45 × 2/3 + 1/3 × 15

27.7/ 19 + 12/ 19 × 5/6

28. 1/4 + 3/4 ÷ 2/3

29.8/7 × 2 1/ 16 + 1/2

30. 10 1 × 1/5 – 1/5 × 2 1

3 1.50+ 160÷40 (58+370)÷(64-45)

32. 120- 144÷ 18+35

33.347+45×2-4 160÷52

34(58+37)÷(64-9×5)

35.95÷(64-45)

36. 178- 145÷5×6+42 420+580-64×2 1÷28

37.8 12-700÷(9+3 1× 1 1) ( 136+64)×(65-345÷23)

38.85+ 14×( 14+208÷26)

39.(284+ 16)×(5 12-8208÷ 18)

40. 120-36×4÷ 18+35

4 1.(58+37)÷(64-9×5)

42.(6.8-6.8×0.55)÷8.5

43.0. 12× 4.8÷0. 12×4.8

44.(3.2× 1.5+2.5)÷ 1.6 (2)3.2×( 1.5+2.5)÷ 1.6

45.6- 1.6÷4= 5.38+7.85-5.37=

46.7.2÷0.8- 1.2×5= 6- 1. 19×3-0.43=

47.6.5×(4.8- 1.2×4)= 0.68× 1.9+0.32× 1.9

48. 10. 15- 10.75×0.4-5.7

49.5.8×(3.87-0. 13)+4.2×3.74

50.32.52-(6+9.728÷3.2)×2.5

5 1.[(7. 1-5.6)×0.9- 1. 15] ÷2.5

52.5.4÷[2.6×(3.7-2.9)+0.62]

53. 12×6÷( 12-7.2)-6 (4) 12×6÷7.2-6

102×4.5

7.8×6.9+2.2×6.9

5.6×0.25

8×(20- 1.25)

1) 127+352+73+44 (2)89+276+ 135+33

( 1)25+7 1+75+29 +88 (2)243+89+ 1 1 1+57

9405-2940÷28×2 1

920- 1680÷40÷7

690+47×52-398

148+3328÷64-75

360×24÷32+730

2 100-94+48×54

5 1+(2304-2042)×23

42 15+(436 1-7 16)÷8 1

(247+ 18)×27÷25

36-720÷(360÷ 18)

1080÷(63-54)×80

(528+9 12)×5-6 178

8528÷4 1×38-904

264+3 18-8280÷69

( 174+209)×26- 9000

8 14-(278+322)÷ 15

1406+735×9÷45

3 168-7828÷38+504

796-5040÷(630÷7)

285+(3000-372)÷36

1+5/6- 19/ 12

3x(-9)+7x(-9

(-54)x 1/6x(- 1/3)

1. 18. 1+(3-0.299÷0.23)× 1

2.(6.8-6.8×0.55)÷8.5

3.0. 12× 4.8÷0. 12×4.8

4.(3.2× 1.5+2.5)÷ 1.6 (2)3.2×( 1.5+2.5)÷ 1.6

5.6- 1.6÷4= 5.38+7.85-5.37=

6.7.2÷0.8- 1.2×5= 6- 1. 19×3-0.43=

7.6.5×(4.8- 1.2×4)= 0.68× 1.9+0.32× 1.9

8. 10. 15- 10.75×0.4-5.7

9.5.8×(3.87-0. 13)+4.2×3.74

10.32.52-(6+9.728÷3.2)×2.5

1 1.[(7. 1-5.6)×0.9- 1. 15] ÷2.5

12.5.4÷[2.6×(3.7-2.9)+0.62]

13. 12×6÷( 12-7.2)-6

14. 12×6÷7.2-6

15.33.02-( 148.4-90.85)÷2.5

High demand! ! ! ! !

1.3/7 × 49/9 - 4/3

2.8/9 × 15/36 + 1/27

3. 12× 5/6 – 2/9 ×3

4.8× 5/4 + 1/4

5.6÷ 3/8 – 3/8 ÷6

6.4/7 × 5/9 + 3/7 × 5/9

7.5/2 -( 3/2 + 4/5 )

8.7/8 + ( 1/8 + 1/9 )

9.9 × 5/6 + 5/6

10.3/4 × 8/9 - 1/3

1 1.7 × 5/49 + 3/ 14

12.6 ×( 1/2 + 2/3 )

13.8 × 4/5 + 8 × 1 1/5

14.3 1 × 5/6 – 5/6

15.9/7 - ( 2/7 – 10/2 1 )

16.5/9 × 18 – 14 × 2/7

17.4/5 × 25/ 16 + 2/3 × 3/4

18. 14 × 8/7 – 5/6 × 12/ 15

19. 17/32 – 3/4 × 9/24

20.3 × 2/9 + 1/3

2 1.5/7 × 3/25 + 3/7

22.3/ 14 ×× 2/3 + 1/6

23. 1/5 × 2/3 + 5/6

24.9/22 + 1/ 1 1 ÷ 1/2

25.5/3 × 1 1/5 + 4/3

26.45 × 2/3 + 1/3 × 15

27.7/ 19 + 12/ 19 × 5/6

28. 1/4 + 3/4 ÷ 2/3

29.8/7 × 2 1/ 16 + 1/2

30. 10 1 × 1/5 – 1/5 × 2 1

3 1.50+ 160÷40 (58+370)÷(64-45)

32. 120- 144÷ 18+35

33.347+45×2-4 160÷52

34(58+37)÷(64-9×5)

35.95÷(64-45)

36. 178- 145÷5×6+42 420+580-64×2 1÷28

37.8 12-700÷(9+3 1× 1 1) ( 136+64)×(65-345÷23)

38.85+ 14×( 14+208÷26)

39.(284+ 16)×(5 12-8208÷ 18)

40. 120-36×4÷ 18+35

4 1.(58+37)÷(64-9×5)

42.(6.8-6.8×0.55)÷8.5

43.0. 12× 4.8÷0. 12×4.8

44.(3.2× 1.5+2.5)÷ 1.6 (2)3.2×( 1.5+2.5)÷ 1.6

45.6- 1.6÷4= 5.38+7.85-5.37=

46.7.2÷0.8- 1.2×5= 6- 1. 19×3-0.43=

47.6.5×(4.8- 1.2×4)= 0.68× 1.9+0.32× 1.9

48. 10. 15- 10.75×0.4-5.7

49.5.8×(3.87-0. 13)+4.2×3.74

50.32.52-(6+9.728÷3.2)×2.5

5 1.[(7. 1-5.6)×0.9- 1. 15] ÷2.5

52.5.4÷[2.6×(3.7-2.9)+0.62]

53. 12×6÷( 12-7.2)-6 (4) 12×6÷7.2-6

My brother's age 7 years ago is equal to my sister's age 5 years later. Brother () was just three times as old as his sister?

2. The first number to the left of the six digits is 1. If you move this number 1 to the far right, this six-digit number is three times the original number. Find this number.

After the summer camp, Dongdong, Xixi and Nannan took a taxi home together because of their heavy luggage. After 9 kilometers, Dongdong got off first; After another 9 kilometers, Xixi got off; After another 9 kilometers, Nannan also got off. South-South A * * * paid the 54 yuan fare to the driver. How to share these fares reasonably? (excluding taxi fare)

First, fill in the numbers according to the law.

1)64,48,40,36,34,( )

2)8, 15, 10, 13, 12, 1 1,( )

3) 1、4、5、8、9、( )、 13、( )、( )

4)2、4、5、 10、 1 1、( )、( )

5)5,9, 13, 17,2 1,( ),( )

Second, arithmetic progression.

1. In arithmetic progression, 9 12, 2 1, 30, 39, 48, …

2. Find the sum of all integers between 1 and 100 that are not divisible by 5 or 9.

3. Divide 2 10 by the sum of seven natural numbers, so that after the seven numbers are arranged in a row from small to large, the difference between two adjacent numbers is 5. So, what is the number of 1 and the sixth number?

4. Group all odd numbers starting from 1, where the first number of each group is equal to the number of all numbers in the group, such as (1), (3,5,7), (9,0/1,13,660.

Third, the average problem.

1. The average number of 9 known is 72. After removing a number, the average of the remaining numbers is 78, and the removed number is _ _ _ _ _.

There are 40 students in a class, and two students missed the mid-term math exam for some reason. At this time, the average score of the class is 89, and the students who are absent from the exam each get 99 points. The average score of the senior high school entrance examination in this class is _ _ _ _ _ _ _ _.

In the first five months of this year, Xiaoming saved money in 4.2 yuan on average every month. Since June, he has saved 6 yuan every month. Since which month, Xiaoming has saved more money than 5 yuan on average?

4.a, B, C, D, remove one number at a time and average the remaining three numbers. This is calculated four times, and the following four numbers are obtained.

23, 26, 30, 33

What is the average of a, b, c and D 4?

Remove one of the five numbers A, B, C and D4 at a time, and average the remaining three numbers, so that the following four numbers 23, 26, 30 and 33 are counted four times, and the sum of A, B, C and D4 is.

Fourth, simple operations of addition, subtraction, multiplication and division

1) 100-98+96-94+92-90+……+8-6+4-2=( )

2) 1976+ 1977+……2000- 1975- 1976-……- 1999=( )

3)26×99 =( )

4)67× 12+67×35+67×52+67=( )

5)( 14+28+39)×(28+39+ 15)-( 14+28+39+ 15)×(28+39)

2. Fill in nine consecutive natural numbers in the nine spaces of three rows and three columns, so that the sum of the three numbers in each row and each vertical column is equal to 60.

3. Fill nine consecutive odd numbers starting from 1 into nine spaces in three rows and three columns, so that the sum of three numbers in each row, each column and two diagonal lines is equal.

4 Make a third-order magic square with 9 numbers from 1 to 9, and write all possible results. The so-called magic square refers to filling different numbers in each square of the square grid table, so that the sum of numbers on each row, column and two diagonal lines is equal; Order refers to the number of squares contained in each row and column.

Sixth, the problem of sum and difference times.

1. There are 340 peach trees and apricot trees planted in the orchard, of which the number of peach trees is 20 times more than that of apricot trees. How many trees have been planted?

2. Rectangular, 30cm in circumference, twice as long and wide. Find the area of this rectangle.

3.A and B are two numbers. If A plus 320 equals B, if B plus 460 equals 3 times A, what are these two numbers?

There are two pieces of cloth with the same length. The first piece sells for 25 meters, the second piece sells for 14 meters, and the remaining piece of cloth is twice as long as the first piece. How many meters is each piece of cloth?

There are 150 peach and pear trees in the orchard. There are 20 more peach trees than pear trees. How many fruit trees are there?

6. Two barrels of oil A and B weigh 30 kilograms. If 6 kilograms of oil in barrel A is poured into barrel B, the weight of the two barrels of oil is the same. How much oil do they have?

Seven, the age problem

1. The two brothers are 30 years old this year. When my brother and brother are the same age now, my brother is exactly half his age. How old is my brother this year?

The mother and daughter are 64 years old, and the daughter is three years older than her mother. How old are the mother and daughter?

My brother is older than Xiaoli this year 12 years old. Eight years ago, my brother was four times older than Xiaoli. How old are they this year?

Grandpa is 72 years old and grandson 12 years old. A few years later, grandpa was five times as old as his grandson. A few years ago, my grandfather was 13 times older than my grandson.

Eight. Hypothetical problem

1.42 students participated in tree planting, with an average of 3 trees planted by boys and 2 trees planted by girls, with 56 more trees planted by boys than girls. How many boys and girls are there?

2. A primary school held a math contest with *** 15 questions. He gets 8 points for every right question and 4 points for every wrong question. Xiaoming got 72 points in the exam. How many questions did he get right?

There are 25 questions in a test paper. Answer one question correctly and get 4 points. Answer correctly or not, get 1 point. A classmate will get 60 points. He answered several questions correctly.

4. Xiaohua answers math judgment questions, giving 4 points for a correct answer and 4 points for a wrong answer. She answered 20 true and false questions and got only 56 points. She answered several questions wrong.

5. Yucai Primary School held a math contest in the fifth grade. There are *** 10 questions. She gets 8 points for each correct question, and 5 points for wrong questions. Zhang Xiaoling finally got 4 1 point. How many questions did she answer correctly?

First, the calculation problem (if it can be calculated by a simple method, a simple algorithm should be used. 4 points for each question, *** 12 points. )

2. 1994+ 199.4+ 19.94+ 1.994

2. Fill in the blanks (5 points for each question from 1 to 7, 7 points for each question from 8 to 10, and 56 points for * * *. )

1. Primary School Mathematics Newspaper is published once a week and on Friday. The issue of 65438+ 10 of 1994 was published on 1 0 of 1995, and the issue of 1995 should be/kloc-0.

2. In arithmetic progression 6, 13, 20, 27, …, the number _ _(shǔ) is 1994 from left to right.

If the number 6 is written after one digit of a number, the new number is increased by 6000. The original number is _ _ _ _.

4. There are seven different prime numbers, the sum of which is 60, and the smallest prime number is _ _ _ _.

5. In the picture on the right, * * * has _ _ _ trapezoids.

6. In the formula "(□-7×□) ÷ 16 = 2", □ "represents the same number and is _ _ _ _.

7. Both Figure 1 and Figure 2 are composed of the same small squares. The circumference of Figure 1 is 22 cm, so the circumference of Figure 2 is _ _ _ _ cm.

8. There are two scores A and B:

Compared with these two scores, _ _ _ is greater than _ _.

9. Let a△b=a×a-2×b, then 5 △ 6 = _ _ _, (5△2)△3=____.

10. There are 25 red chopsticks, 25 black chopsticks, 25 white chopsticks, 25 yellow chopsticks, 25 purple chopsticks and 25 flower chopsticks, all of which have the same shape and length. Look for at least _ _ _ _ pairs of chopsticks in the dark, and make sure there are at least 8 pairs of chopsticks (one pair for every two chopsticks with flowers, or one pair for two chopsticks of the same color).

Three, short answer questions (8 points)

If 26 numbers are randomly selected from 50 numbers of 1, 2, 3, 4, …, 49, 50, then at least two of these 26 numbers are coprime. Q: Why is this?

Fourth, the application problem (write a list of problem-solving processes. 6 points for each question, ***24 points. )

1. Xiaoming leaves home at 6: 50 every morning and arrives at school at 7: 20. The teacher asked him to arrive at school six minutes early tomorrow. If Xiaoming leaves home at 6: 50 tomorrow morning, he must walk 25 meters more than usual every minute according to the teacher's request to get to school on time. Q: How far is Xiaoming's home from school?

2. My daughter is 1994 years old this year. Mother said to her daughter, "When you reach my age, I will be 60 years old!" " "Q: When was Mom 12 years old?

3. Tintin and Ningning each have a box with chess pieces in it, and the chess pieces in both boxes are * * *.

Seven, the age problem

1. The two brothers are 30 years old this year. When my brother and brother are the same age now, my brother is exactly half his age. How old is my brother this year?

The mother and daughter are 64 years old, and the daughter is three years older than her mother. How old are the mother and daughter?

My brother is older than Xiaoli this year 12 years old. Eight years ago, my brother was four times older than Xiaoli. How old are they this year?

Grandpa is 72 years old and grandson 12 years old. A few years later, grandpa was five times as old as his grandson. A few years ago, my grandfather was 13 times older than my grandson.

29. On the first day, master and apprentice processed 225 parts, and on the second day, new technology was adopted. The number of parts processed by the master increased by 24% compared with the first day, and the number of apprentices increased by 45%. Two people processed 300 parts. How many parts did the master process the next day? How many parts did the apprentice process?

30. Struggle Primary School organizes sixth-grade students to go camping and training in Baihua Mountain, and the journey is increased by 2 kilometers every day. I went for four days and came back for three days. How many kilometers is the school from Baihua Mountain?

Comprehensive Training of Mathematical Application Problems in Primary Schools (04)

3 1. The standard for charging electricity in a certain place is: the monthly electricity consumption does not exceed 50 degrees, and the electricity fee is charged at 50 cents per degree; If it exceeds 50 degrees, the excess will be charged at 80 points per degree. Every month, user A pays 3 yuan and 30 cents more than user B. How many kWh did users A and B use this month?

Master Wang plans to process a batch of parts in two hours. When there were 160 parts left, the machine broke down and the efficiency was lower than before 1/5. As a result, the task was completed 20 minutes later than originally planned. How many parts are there in this batch?

33. Mom gave Honghong some money to buy New Year cards, including three kinds of cards: A, B and C. Each card of A is 1.20 yuan. How much did Mom give Hong Hong to buy one card instead of eight cards B and six cards B? How much is the second card?

34. An old man has five sons and three houses. Before he died, he made a will and gave three houses to his three sons. As compensation, the three sons who were assigned to the house each took out 1.200 yuan and divided it equally among the two sons who were not assigned to the house. Everyone says this distribution is fair and reasonable, so how much is each house worth?

35. Xiaoming and Xiaoyan have less than 20 picture books. If Xiaoming gives Xiaoyan an A, Xiaoming's picture book is twice as big as Xiaoyan's. If Xiaoyan gives it to Xiao Amin, Xiao Ming's picture book is three times as big as Xiaoyan's. How many picture books do Xiaoming and Xiaoyan have?