(5x-y)²+(-5x+y)(y+5x)-10x(x-y)
问题描述:
(5x-y)²+(-5x+y)(y+5x)-10x(x-y)
计算题
答
解(5x-y)²+(-5x+y)(y+5x)-10x(x-y)=25x²-10xy+y²+y²-25x²-10x²+10xy=(25x²-25x²-10x²)+(10xy-10xy)+(y²+y²)=-10x²+2y²