化简x分之y-y分之x-xy分之x²+y²的结果是?

问题描述:

化简x分之y-y分之x-xy分之x²+y²的结果是?

x分之y-y分之x- (xy)分之(x²+y²)
=(xy)分之[y²-x²-(x²+y²)]
=(xy)分之2y²
=x分之2y是-x分之2y把?抱歉,做错了。更正如下:x分之y-y分之x- (xy)分之(x²+y²)=(xy)分之[y²-x²-(x²+y²)]=(xy)分之(-2x²)=-y分之2x