{(x-2y)^2-4y^2+2xy}÷2x
问题描述:
{(x-2y)^2-4y^2+2xy}÷2x
答
{(x-2y)^2-4y^2+2xy}÷2x
=(x^2-4xy+4y^2-4y^2+2xy)÷2x
=(x^2-2xy)÷2x
=x/2-y