Ответ:

1 2ax+2ay+bx+by

2 ay-by-a+b

3 c+3-cx-3x

4 10p-10

5 -a²-2a+3

6 -(b-2)(3b-7)

7 ab-ac+cd-bd

8 xy-5x-5y+y²

9 6ax+21a+35b-10bx

10 (x-y)(1+a)

11 4a-8

12 -9+3b

Kein Gewitter