Fill in the blanks
1.9; 27; 27; nine
2.750
3.30; 990
4.？ Four digits? 3 (4290, 4590, 4890)
5.2; three
6. 17(2、3、5、7)
7.39 1( 17、23)
8.2 10=2? 3? 5? 7; 16; 23 10; 2
9.6; 24; 14; 15
10. 1, 12 or 3,4
1 1.b； a
12. 1; abdominal muscle
13. 14; Forty two.
14.59
15.52; 13; 13; 52; 52; 13
16.②⑥; ①②④⑥
17.4,9 or 8,9 or 9, 10
18. 198 or 192
19.8520; 2085
20.0 or 6(9 120, 9 126)
2 1. Abdominal muscles
22.400( 135=5? 3? 3? 3, 1925=5? 5? 7? 1 1,486=2? 3? 3? 3? 3? 3)
Second, multiple choice questions
23.D
24.A
25.C
26.D
27.A
28.D
3. Find the minimum common multiple and maximum common factor of the following groups.
29.(87, 145)=29; = 144
3 1.(35,56, 105)=7; =22440
Step 4 solve the problem
33.4+ 15=9+ 10
4+ 15+9+ 10=38
34. 144? (2+3+7)= 12
So these three numbers are 24, 36 and 84 respectively.
35.954,873,62 1
36.260=2? 2? 5? 13=4? 65
37.- 1=59
38.= 12
3? 8? 12+ 1=3
39.63+9 1+ 129-25=258
258=2? 3? 43
So this integer is 43.
Winter vacation homework (2) the answer
Fill in the blanks
1.b； a
2.3,5,7; 4,6,8, 10; nine
3.2 10
4.60
5.( 1) 1; 1 1; 3; 9; 5; seven
(2)2; 10; 4; 8; 6; six
(3)4; eight
(4)5; seven
6.36; 36=2? 2? 3? three
7.70 1(700= 1? 700)
8.4 (Let B be X, then A is 6x+2, and C is 6(6x+2)+2, so x+6x+2+6(6x+2)+2= 188, and x=4).
9.2; 4; 1; 0; 0
10. 1 and 21; 3 and19; 5 and17; 7 and15; 9 and 13 (select three groups)
1 1.32
12. 14
13. and others
14.
15.2.5(20 =2.5)
16.
2. Multiple choice problem
1.a； B
2.B( 1+2=3)
3.B(3，5， 1 1， 17，29)
4.A
5.D
6.A
7.B
8.B( 18+30=48)
9.d( 1000- 142-76+ 10 = 792)
10.D (=24)
Three. Computational problem
1.2
2.23
Step 4 solve the problem
1.90= 1? 90=2? 45=3? 30=5? 18=6? 15=9? 10
So there are six kinds, namely 1 and 90,2 and 45,3 and 30,5 and18,6 and15,9 and 10.
2.336=2? 2? 2? 2? 3? 7=6? 7? eight
6+7+8=2 1
3.( 1)260=2? 2? 5? 13
So these two numbers are 4 and 65.
(2)420=2? 2? 3? 5? seven
So these two numbers are 4 and 105, 12 and 35, 15 and 28, 20 and 2 1.
4.( 1)
(2)
leave out
6.( 1)48=2? 2? 2? 2? three
So A=3 and B= 12.
(2) Omission
7.( 1) 16=3+ 13=5+ 1 1=7+9
So there are six such simplest scores,
(2) 1 1,
8. A situation:
In another case:
Winter vacation homework (3) the answer
Fill in the blanks
1.；
2.
3.
4.3; six
5.
6.5; 23; 2; 22
7.
8. (Let the original score be, then there is, and the solution is x=40)
9.；
10.5( )
1 1.9, 10, 1 1, 12, 13( )
12.( )
13.3; eight
14. 168(= 168)
15.5
16.28
2. Multiple choice problem
18.C
19.A
20.C
2 1.C
22.B
23.D
24. B ()
Three. solve problems
25.( 1)= 180
(2) 1800? 180+ 1= 1 1
26.2 1n+2(n= 1，6， 1 1， 16？ )
The factor of 27.24 is 1, 2, 3, 4, 6, 8, 12, 24, so there are eight n's, namely 1, 2, 3, 4, 6, 8, 12, 24;
Yes 1, n= 1.
28.( 1)
(2)
(3)
29.( 1)( 1+27)? 27? 2+ 15=393
(2)( 1+ 14)? 14? 2= 105
1 15- 105= 10
So the score of 1 15 is
30.( 1+ 10)? 10? 2=55
Winter vacation homework (4) the answer
fill (up) a vacancy
1.
2. 12:2:9; 9: 10
3.35:42: 18 (A: B =5:6, B: C =7:3)
4.； 45%
5.
6. 1300000( 104000? 8%= 1300000)
7. the seventh five-year plan ((64- 16))? 64? 100%=75%)
8.5(6? ( 1+20%)=5); 90(72? ( 1-20%)=90)