分解因式(x-1)²-49 9(a-b)²-30(a-b)+25 -3ax²+6axy-3ay²

问题描述:

分解因式(x-1)²-49 9(a-b)²-30(a-b)+25 -3ax²+6axy-3ay²
(x-1)²-49、 9(a-b)²-30(a-b)+25 、-3ax²+6axy-3ay²

1.(x-1-7)(x-1+7)=(x-8)(x+6)
2.(3(a-b))^2-30(a-b)+5^2
=[3(a-b)-5]^2
3.(-3ax+3ay)(x-y)第三题错了,应该是-3a(x-y)²