In the eighth grade, I went to winter vacation homework Jiangsu People's Publishing House to do math exercises 7 and 8.

Exercise1:1.32.40,40 3.8,6 or 7,7 4.5cm 5.50,130,506.67.158. (2) .4, 8, 30 9.B 10。 A 1 1。 B 12。 B 13。 D 14。 C 15。 D 16。 A

Exercise 2:1.a2.c3.c4.d5.b6.c7.b8.b9.a10.b1.c12.c1. 3/416.13,4,917.1/218. Percentage, 3 19. 4 1 under the root sign.

Exercise 3:1.d2.b3.d4.d5.c6.b7.d8.d9.10cm10.901.30cm212. 1 15 13.20cm 14. 180 15.90，45，4，2+06. 13/6。

Exercise 4: Graph, Algebraic Expression 2. (2, -3) 3.4, 3.4.(2, 1), (2, - 1) 5.(3,-3) 6.C7.C8.B9.B 10。

Exercise 5:1.b2.b3.d4.a5.a6.a7.c8.b9.s =1.5a (m2)10.k =-21. -2 65438.5 13.7 14.V: 10+5t (0≤t≤ 16)， 16 15:{X=2 Y=7，(2，7) 16:y=2x+ 1

Exercise 6:1.3 2.3 3.5 4.100 5.2. 5 6.97 7.9 8.86.5 9.C 10。 C 1 1。 C 12。 D

Exercise 7:1.c2.d3.a4.b5.c6.d7.c8.b9.c10.c1.312. (0,6) 9 lines 13. 1.8× 10, 9 times 14.36, 3 15, (41)1. (under the root sign 1+.

Exercise 8:1.b2.a3.a4.a5.c6.c7.a8.d9.a10.d1.212. -213.8317. (-4,2)18.4,4 is under the root number 5 16 or 17 16. 2.

In other words, it would be better if there were answers to big questions. I want them too.