分解因式:1、(x-2)(x+3)-(x+3)²;2、-4x的3次方y+16x²y²-16xy的3次方;
问题描述:
分解因式:1、(x-2)(x+3)-(x+3)²;2、-4x的3次方y+16x²y²-16xy的3次方;
3、x²(x-y)+y²(y-x);4、-0.04x²+0.01y²
答
1、(x-2)(x+3)-(x+3)²=(x+3[x-2-(x+3)²]=(x+3)(x-2-x²-6x-9)= (x+3)(-x²-5x -11)= -(x+3)(x²+5x + 11)2、-4x的3次方y+16x²y²-16xy的3次方=-4xy(x²-4xy + 4y²)=-...