[(x+2y)²-(x+y)(x-y)-4y²]÷2y
问题描述:
[(x+2y)²-(x+y)(x-y)-4y²]÷2y
答
[(x+2y)²-(x+y)(x-y)-4y²]÷2y =[x^2+4xy+4y^2-(x^2-y^2)-4y^2]÷2y
=[x^2+4xy+4y^2-x^2+y^2-4y^2]÷2y
=[4xy+y^2]÷2y
=2x+y/2