1. 1 wrong 2 wrong 3 right 4 wrong 5 wrong 6 wrong

Ii. 7.d8.c9.a10.a1.b12.d13.a14.c15.

Three. The square of 18.a minus the square of 3b 19. Two points determine a straight line 20.72 2 1.4 22.4 23. 3,6 (3.6) 24.6.

(1)-2 (2)-226. (1)19a-17b (2) When m=-3, the value of the algebraic expression is 1927. (65438

Do the rest by yourself, because typing is very troublesome.