(2x+y-1)²(a+b)²-4(a+b+1)4+12(x-y)+9(x-y)²x³-9x6xy²-9x²y-y³

问题描述:

(2x+y-1)²
(a+b)²-4(a+b+1)
4+12(x-y)+9(x-y)²
x³-9x
6xy²-9x²y-y³

第一个不能分解因式.(a+b)²-4(a+b-1)=(a+b)²-4(a+b)+4=(a+b-2)²4+12(x-y)+9(x-y)²=(2+3x-3y)²x³-9x=x(x²-9)=x(x+3)(x-3)6xy²-9x²y-y³=y(...