1.2
2.96
3. 13
4. Four
5.7 9 Special Rectangular Square Matrix
1 1 176
6. 12 yuan
7. 123cm
8. 16
9. 12 volumes, 23 volumes
10.49/ 100
Exercise 2
1.D
2.D
3.D
4.D
5.D
6.C
7.C
8.D
9.-2
10. 1/2
1 1.5. 1? 10^8
12.5
13.2/25
14. 1/4 =
15.-8/8
16. 1/6
17. 1 1 1/ 10
18.-3/ 10
19. 1
20. 10/2 1
2 1.①. All 8 seats, 5 cars ② all 4 seats, 9 cars ③ 1 seat, 4 seats, and the remaining 8 seats 8 seats.
7 seats with 4 seats 1 8 seats with 7 * 200+1 * 300 =1700a:1700 yuan 7 seats with 4 seats18 seats.
Exercise 3
1.A
2.D
3.A
4.A
5.B
6.C
7.B
8.D
9.A
10.A
1 1.(2a)?
12.6x-y y+z
13.5m-4
14.2/3
15. 1/9
16.6 or 5
17.4xy? -xy+8y? - 1 1x-8xy- 17y?
18. 18a- 18b-2
19.25
20.- 14 - 1 1 -5 -2 4 16
0 0.2 0.6 0.8 1.2 2
Exercise 4
1.C
2.C
3.C
4.C
5.A
6.C
7.D
8.A
9.2
10. 1/3
1 1.5
12. 1.2
13.8.4
14. 180 ,240, 480
15.-5/9
16.- 12
17.- 12/7
18.K=5/3 X= -29/5
19. 16 PCs/hour
20.K=0.6 K=2/3
Exercise 5
1.D
2.D
3.C
4.A
5.B
6.D
7.B
8.D
9. Omit 4 1 1
10.9 6 5 6 4 4
1 1. 18
12. Cone
13.2
six
five
14. Omit
15.6 9 5 8 12 6 8 13 7 10 15 7
16.z+x-2=y
Exercise 6
1.D
2.C
3.B
4.B
5.B
6.B
7.D
8.34 22 12 36 177/600 25? 5? 16?
9.60?
10.3
1 1.75
12.5
13.45
14. Parallel, because parallel lines parallel to the same plane are parallel to each other.
15. BM = 2cm Mn = 5cm.
16.40? 120? 120?
17. Omit
18. (1) FOB AOD
19. slightly 90?
Exercise 7
1.D
2.B
3.C
4.D
5.B
6.C
7.2.7
8.3a-2b
9.a cube +b? /2
10.0
1 1.25
12.90 45
13. 10
14.60 30
15.-8
16.2 1
17.S=a? +b? -[ 1/2(a+b)b+ 1/2a? ]32.5 square centimeters
18.6 km/h
19.7 2.5
20. 13 2a-b
2 1.740 yuan has a level of 45.
There are 5 people in Class Two and 58 people.
Exercise 8
1.C
2.C
3.B
4.D
5.A
6.A
7.C
8.D
9. 1/5 -2
10.2
1 1. Cone
12.7
13.40
14. 12
15.7
16.3 45
17. 17 168
18.-7 3.5
19.45
20.34
21.7127/144 equals 507.
22. Schoolbag 92 yuan Walkman 360 yuan
23. Times Supermarket
24. 1 -2 -20
25.60? a piece of cake