Number and algebra 1, decreased by 2.9%.

2 12.5 m2

3, the original price of 32 yuan

4. 12000 copies

5. Enough.

6. Xiao Qiang 0 kg, Xiao Li -2 kg, Xiaodong +2 kg, Xiao Bing+1 kg, Xiaohong-1 kg.

7. Simplify. (across) 3:16: 7 5: 3 3: 25 4: 310: 3 25:11:4

8、26:5 26/5

9、( 1)6:5 6/5 (2)6:5 6/5 (3)36:25 36/25

10, 300g leek, and egg150g.

1 1, 20,000 yuan for Chen Ming and 25,000 yuan for Zhao Dong.

12, (1) Answer: The speed of this coach is 60km (2) from 8: 00 to 1 1: 00.

Space and graphics 13, (1) perimeter: 12.56 cm area: 12.56 cm 2 perimeter: 9.42 cm area: 7.065cm2.

14, 189.76 m2

15, smile quickly

16，( 1) 1 13.04 cm2(2)3 1.4cm。

17, perimeter: 12.56cm, area: 20.56cm.

18, 25 laps

19.A: Figure A rotates 90 degrees counterclockwise around vertex O, then translates 5 squares to the right, and then translates 2 squares downward to get Figure B (different answers).

20, painting slightly

2 1, omitted

22.( 1) Cannot (2) Draw a sketch.

Statistics 23, d

24, painting slightly

I hope I can help you.