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

36+59+4 1+54

23×7+23×3

1462-369-63 1

60506- 19460÷35

23072÷4 12×65

184×38+ 1 16×38- 1 1300

(7969 1-46354)÷629

325÷ 13×(266-250)

74+ 100÷5×3

(440-280)×(300-260)

100+25×3-90

12)90÷2+ 136

70×74+ 100÷5

38+ 1 16×7+23

369-(63 1 ÷5)×3

3/7 × 49/9 - 4/3

8/9 × 15/36 + 1/27

12× 5/6 – 2/9 ×3

8× 5/4 + 1/4

.6÷ 3/8 – 3/8 ÷6

4/7 × 5/9 + 3/7 × 5/9

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

7/8 + ( 1/8 + 1/9 )

9 × 5/6 + 5/6

3/4 × 8/9 - 1/3

7 × 5/49 + 3/ 14

6 ×( 1/2 + 2/3 )

8 × 4/5 + 8 × 1 1/5

3 1 × 5/6 – 5/6

9/7 - ( 2/7 – 10/2 1 )

5/9 × 18 – 14 × 2/7

4/5 × 25/ 16 + 2/3 × 3/4

14 × 8/7 – 5/6 × 12/ 15

17/32 – 3/4 × 9/24

3 × 2/9 + 1/3

5/7 × 3/25 + 3/7

3/ 14 ×× 2/3 + 1/6

1/5 × 2/3 + 5/6

9/22 + 1/ 1 1 ÷ 1/2

5/3 × 1 1/5 + 4/3

45 × 2/3 + 1/3 × 15

7/ 19 + 12/ 19 × 5/6

1/4 + 3/4 ÷ 2/3

8/7 × 2 1/ 16 + 1/2

10 1× 1/5– 1/5 x99

Who can give me 20 math problems 1, 475+254+36 1 2, 615+475+1253,860-168+059?

4、465+358-27 5、647-(85+265) 6、476+(65-29)

7、 154×8÷ 16 8、400÷25×75 9、 16×25÷ 16×25

10、552÷69×8 1 1、600- 120÷ 10 12、(600- 120)÷ 10

13、(466-25×4)÷6 14、(43+32)÷(357-352)

15、 138+(27+48)÷25 16、56× 19+25×8

Urgent! Who can give me 600 to the off-line calculation problem 3643-74+6357-76?

(2)39×24+39×46+39×30

(3) 108×35

(4)345×98

(5)25×64× 125×5

(6)8500÷25

(7)94×73+27×94

(8) 125×79

(9) 1.2×99

( 10)9÷0.25

( 1 1)4.7×5.9+5.2×4.7-4.7×0. 1

( 12)3.6×2.4+36×0.76

( 13)(3.25×7+3.25)×0. 125

( 14)37.5÷8÷ 1.25

( 15) 1. 1 1-8.5×(7. 1-0. 1 1)×0

( 16) 17/ 18- 1 1/27-5/ 18-7/27

( 17)9/ 10+5/6+9/ 10-5/6

( 18) 1.3+ 1/4- 1/2+ 1/4-0.2÷4

( 19) 12.5×88

(20)4.8÷( 1.6×0.2)

(2 1)3.2×0.25× 1.25

(22) 1/3+ 1/6+ 1/9+ 1/ 18

(23)(3/ 1 1+0.87+0.23-3/ 1 1)÷0.03

(24)0.5×[3/4-(7/ 16-0.25)]

(25) 1999+999×999

(26) 12.75-(3/8+3/4)

(27)( 1.2+0.25)×3×4

(28)0.375× 10 1-37.5

(29)7.2× 1000÷ 125

(30)53/6+37/4-23/6

(3 1) 10-( 1/2+ 1/ 10)

(32)24700-5278÷26× 108

(33)3-5/ 13-8/ 13

(34)532.7-2.47

(35)0.084×7.5

(36)9 13.5÷0.29

(37)6.55×3.45

(38) 126.6÷3. 1

(39)0. 1435÷ 1.5

(40)275+2254÷5- 100

(4 1)4÷( 1÷0.4)

(42) 1÷0.2+(2-0.7)×5

(43)9×3- 1.7x= 13.4

(44)2X=0.8÷2

(45)4(x-9)=8

(46)x-4.8+3.2= 12

(47)0.3×5+3x=4.5

(48)2x- 1.5x=0.8

(49)x-0.8x-6= 16

(50) 1+0.2x= 1.6

(5 1) 1.5x=0.9×3.6

(52)3/4÷0.75=3

(53)(2.8+x)×4.5=72×0.5

(54)0.6x-0. 1x=2

(55)280+720

(56) 1076-86

(57)32×0.25

(58) 1/3+ 1/5

(59)302

(60)0. 1÷ 1%

(6 1)3. 14×7

(62)2/5- 1/4

(63)6300÷70

(64)45×3/ 15

(65) 1/7- 1/9

(66)36-4/9

(67)45-0.5

(68)5/6- 1/6

(69)2/5+ 1/2

(70)3/4+ 1/6

(7 1)2x-2/5=27/5

(72)4x= 12×4

(73)6.5+2x= 16.5

(74)8. 1÷27×3

(75) 1-2/5- 17/50

(76)4/7-2/5

(77)83

(78)5/6- 1/4+2/3

(79) 1 1/28+(5/ 14+3/7)

(80)7-(3/4-2/5)

(8 1)x+ 1/3=7/9

(82)2x- 1/6=5/6

(83)3/5-x= 1/4

(84)x-4/5x- 1.6= 1.5

(85) 14.6-(4.6+7.2)

(86) 1- 1/2- 1/3- 1/6

(87)3/ 10-7/30+4/ 10

(88)999×85+854×(6.5÷ 1.3)

(89) 1.5-0.05×( 1.5- 1.5)

(90)9/ 10-( 1/6+3/5)

(9 1)4/3-(2/5+3/ 10)

(92)2/5+ 1/3+3/5

(93)20-(5.35+0. 15)+6.3

(94) 1/2-(3/4-3/8)

(95)7/8-5/ 12+ 1/6

(96)7/8+x=9

(97)6/5-x= 1/2

(98)2/5x+3/5x= 1.2

(99)x- 1/3=5/6+5/ 12

( 100) 1-(8/ 13+5/ 13)

I only arrived at 100.

? 600 fifth-grade math problems

Give me 39 ways to calculate 360 ÷ [( 12+6) × 5].

288÷[(26- 14)×8]

500×6-(50×2-80)

( 105× 12-635)÷25

864÷[(27-23)× 12]

(45+38- 16)×24

500-(240+38×6)

[64-(87-42)] × 15

(845- 15×3)÷ 16 12×[(49-28)÷7]

450÷[(84-48] )÷ 12

(58+37)÷(64-9×5)

95÷(64-45)

178- 145÷5×6+42

8 12-700÷(9+3 1× 1 1)

85+ 14×( 14+208÷26)

(284+ 16)×(5 12-8208÷ 18)

120-36×4÷ 18+35

(58+37)÷(64-9×5)

(6.8-6.8×0.55)÷8.5

0. 12× 4.8÷0. 12×4.8

(3.2× 1.5+2.5)÷ 1.6

6- 1.6÷4= 5.38+7.85-5.37=

7.2÷0.8- 1.2×5= 6- 1. 19×3-0.43=

6.5×(4.8- 1.2×4)=

5.8×(3.87-0. 13)+4.2×3.74

32.52-(6+9.728÷3.2)×2.5

[(7. 1-5.6)×0.9- 1. 15] ÷2.5

5.4÷[2.6×(3.7-2.9)+0.62]

12×6÷( 12-7.2)-6

12×6÷7.2-6

0.68× 1.9+0.32× 1.9

(58+370)÷(64-45)

420+580-64×2 1÷28

( 136+64)×(65-345÷23)

48. 10. 15- 10.75×0.4-5.7

388+(5000- 1000)

158+262+ 138

375+2 19+38 1+225

500 1-247- 102 1-232

( 18 1+2564)+27 19

378+44+ 1 14+242+222

276+228+353+2 19

(375+ 1034)+(966+ 125)

(2 130+783+270)+ 10 17

99+999+9999+99999

7755-(2 187+755)

22 14+638+286

3065-738- 1065

899+344

2357- 183-3 17-357

2365- 1086-2 14

497-299

2370+ 1995

3999+498

1883-398

12×25

75×24

138×25×4

( 13× 125)×(3×8)

( 12+24+80)×50

704×25 25×32× 125

32×(25+ 125) 88× 125

102×76 58×98

178× 10 1- 178

84×36+64×84

75×99+2×75

83× 102-83×2

98× 199

123× 18- 123×3+85× 123

50×(34×4)×3

25×(24+ 16)

178×99+ 178

79×42+79+79×57

7300÷25÷4

8 100÷4÷75

16800÷ 120

30 100÷2 100

32000÷400

49700÷700

1248÷24

3 150÷ 15

4800÷25

2356-( 1356-72 1)

1235-( 1780- 1665)

75×27+ 19×2 5

3 1×870+ 13×3 10

4×(25×65+25×28)

( 18 1+2564)+27 19

378+44+ 1 14+242+222

276+228+353+2 19

(375+ 1034)+(966+ 125)

(2 130+783+270)+ 10 17

99+999+9999+99755-(2 187+755)

22 14+638+286 3065-738- 1065

899+344

2357- 183-3 17-357 2365- 1086-2 14

497-299

2370+ 1995

3999+498

1883-398

12×25 75×24

138×25×4

( 13× 125)×(3×8)

( 12+24+80)×50

704×25

25×32× 125

32×(25+ 125)

88× 125

102×76

58×98

178× 10 1- 178

84×36+64×84

75×99+2×75 83× 102-83×2

98× 199

123× 18- 123×3+85× 123

50×(34×4)×3

25×(24+ 16)

178×99+ 178

79×42+79+79×57

7300÷25÷4

8 100÷4÷75

16800÷ 120

30 100÷2 100

32000÷400

49700÷700

1248÷24

3 150÷ 15

4800÷25

2 1500÷ 125

2356-( 1356-72 1)

1235-( 1780- 1665)

75×27+ 19×25

3 1×870+ 13×3 10

4×(25×65+25×28)

Who can give me 20 score calculation problems? 1/20+ 1/5 =

2/3-2/5=

7/24+ 17/24=

1/2- 1/3=

4/5+ 1/5=

5/ 12- 1/3=

3/7-2/7=

7/ 16+9/ 16=

17/32- 15/32=

5/6- 1/3=

3/8+5/8=

6/ 17-5/ 17=

7/8- 1/2=

2/5-2/7=

8/9+ 1/9=

18/49- 1/7=

2/3-5/9=

1/4- 1/5=

2 1/22- 1/ 1 1=

8/ 15- 1/5=

Who can give me 25 equations, 25 ladder equations and 50 application problems in the sixth grade? 4x- 1(25-x)=70

4x-25+x=70

4x+x=70+25

5x=95

x= 19

4x-25+x=70

5x=95

x= 19

4*X-(50-X)*2=20

4x- 100+2x=20

6x=20+ 100

6x= 120

x=20

6X=20+ 100

X=20

2x-3+x=9

2x+x=9+3

3x= 12

x=4

3A/2=6

3A =6×2

3A= 12

A= 12÷3

A=4

1)3X-( 1/2+ 1/4)= 7/ 12

3X=7/ 12+3/4

3X=4/3

X=4/9

6.6-5x = 3/4-4 times.

6.6-0.75 =-4 times +5X

X=5.85

(3) 1. 1X+2.2 = 5.5-3.3X

1. 1X+3.3X=5.5-2.2

4.4 times =3.3 times

X=3/4=4/3

The back is full of questions

0.5+x)+x=9.8÷2

2(X+X+0.5)=9.8

25000+x=6x

3200=450+5X+X

X-0.8X=6

12x-8x=4.8

7.5*2X= 15

1.2x=8 1.6

x+5.6=9.4

52-x = 15

9 1÷x = 1.3

X+8.3= 10.7

15x =3

3x-8= 16

7(x-2)=2x+3

3x+9=27 18(x-2)=270

12x=300-4x

7x+5.3=7.4

3x÷5=4.8

30 \x+25 = 85

1.4×8-2x=6

6x- 12.8×3=0.06

4 10-3x= 170

3(x+0.5)=2 1

0.5x+8=43

6x-3x= 18

1.5x+ 18=3x

5×3-x÷2=8

0.273÷x=0.35

1.8x=0.972

x÷0.756=90

9x-40=5

x÷5+9=2 1

48-27+5x=3 1

10.5+x+2 1=56

x+2x+ 18=78

(200-x)÷5=30

(x- 140)÷70=4

0. 1(x+6)=3.3×0.4

4(x-5.6)= 1.6

7(6.5+x)=87.5

(27.5-3.5)÷x=4

x+ 19.8=25.8

5.6 times =33.6 times

9.8-x=3.8

75.6 \x = 12.6

5x+ 12.5=32.3

5(x+8)= 102

x+3x+ 10=70

3(x+3)=50-x+3

5x+ 15=60

3.5-5x=2

0.3×7+4x= 12.5

x÷ 1.5- 1.25=0.75

4x- 1.3×6=2.6

20-9x= 1.2×6.25

6x+ 12.8= 15.8

150×2+3x=690

2x-20=4

3x+6= 18

2(2.8+x)= 10.4

(x-3)÷2=7.5

13.2x+9x=33.3

3x=x+ 100

x+4.8=7.2

6x+ 18=48

3(x+2. 1)= 10.5

12x-9x=8.7

13(x+5)= 169

2x-97=34.2

3.4x-48=26.8

42x+25x= 134

1.5(x+ 1.6)=3.6

2(x-3)=5.8

65x+7=42

9x+4×2.5=9 1

4.2 x+2.5x= 134

10.5x+6.5x=5 1

89x-43x=9.2

5x-45= 100

1.2x-0.5x=6.3

23.4=2x=56

4x-x=48.6

4.5x-x=28

X-5.7=2. 15

15 5X-2X= 18

3X+0.7=5

3.5×2= 4.2+x

26× 1.5= 2x+ 10

0.5× 16― 16×0.2=4x

13 9.25-X=0.403

16.9÷X=0。 three

X÷0.5=2.6

x+ 13=33

3-5 times =80

1.8 +6x=54

6.7 times -60.3=6.7

9 +4x =40

2x+8= 16

x/5= 10

x+7x=8

9x-3x=6

6x-8=4

5x+x=9

x-8=6x

4/5x=20

2x-6= 12

7x+7= 14

6x-6=0

5x+6= 1 1

2x-8= 10

1/2x-8=4

x-5/6=7

3x+7=28

3x-7=26

9x-x= 16

24x+x=50

6/7x-8=4

3x-8=30

6x+6= 12

3x-3= 1

5x-3x=4

2x+ 16= 19

5x+8= 19

14-6x=8

15+6x=27

5-8x=4

7x+8= 15

9-2x= 1

4+5x=9

10-x=8

8x+9= 17

9+6x= 14

x+9x=4+7

2x+9= 17

8-4x=6

6x-7= 12

7x-9=8

x-56= 1

8-7x= 1

x-30= 12

6x-2 1=2 1

6x-3=6

9x= 18

4x- 18= 13

5x+9= 1 1

6-2x= 1 1

x+4+8=23

7x- 12=8

X-5.7=2. 15

15 5X-2X= 18

3X 0.7=5

3.5×2= 4.2 x

26× 1.5= 2x

0.5× 16― 16×0.2=4x

9.25-X=0.403

16.9÷X=0.3

X÷0.5=2.6

3-5 times =80

1.8-6x=54

6.7 times -60.3=6.7

9 +4x=40

0.2x-0.4+0.5=3.7

9.4x-0.4x= 16.2

12-4x=20

1/3x+5/6x= 1.4

12x+34x= 1

18x- 14x= 12

23 x-5× 14= 14

12+34x=56

22- 14x= 12

23x- 14x= 14

x+ 14x=65

23x= 14x+ 14

30x 12x- 14x= 1

x-0.7x=3.6

Who can give me some simple calculation problems? 1+ 1=2 is the answer.

2+2=4

4+4=8

8+8= 16

Who can give me 50 quadratic root calculation problems? :jl2sy。 /stjj/allfile/st5239.doc

The above addresses include

Who can give me a problem 1: There are 12 balls, one of which is different from the other eleven. Give you a balance and allow three chances to find it. Is it heavier or lighter than the remaining eleven balls?

2. Three tigers each crossed the river with one of their children. There is only one boat on the river, and only two tigers can cross the river at a time. Three big tigers can row a boat, one of them can, the other two can't. If the little tiger is not around his mother, it will be eaten by other big tigers (little tigers don't eat little tigers). How can we get them all to cross the river safely?

Give your teacher a day to study every problem.

Who can give me the design and calculation formula of the speaker? Look for a speaker design. The calculation method is quite complicated, which is related to the following factors:

1. Horn parameters: including equivalent area of diaphragm, resonance frequency and Q value.

2, speaker type: the so-called non-perforated is called a closed box or a closed box; The so-called punching is called an inverter box; There are other structural forms.

3. Leakage of the speaker itself: Apart from the necessary openings, is there any leakage and how much?

4. Target parameters of the speaker to be designed (these parameters are also subject to 1 and 2): low-frequency cutoff frequency and flatness. Even in loudspeaker design books, information such as volume and overall size ratio are usually given by empirical formulas or look-up tables.

If you really don't understand it, then draw a tiger according to the cat and make it with drawings designed by others.

Generally speaking,

5 inches requires 6- 10L volume.

6.5 inches requires 8- 12L volume.

8 inches 10-20L or so.

10 inch takes about 20-40L.

All of the above refers to unpacking, and how much to choose depends on the above calculation.