题目

分解因式喔求完整点 1.y²-9（x+y）² 2.（x+y)²-16（x-y）²
a²b²-0.01 x²y-2xy²+y三次方 16-(2a+3b)² （a²+4）²-16a² a²（a-b）²-b²（a+b）²

提问时间：2020-12-08

答案

y²-9（x+y）² =[y+3(x+y)][(y-3(x+y)]=(3x+4y)(-3x-2y)=-(3x+4y)(3x+2y)（x+y)²-16（x-y）²=[x+y+4(x-y)][(x+y-4(x-y)]=(5x-3y)(5y-3x)a²b²-0.01=(ab+0.1)(ab-0.1) x²y-2xy²...