【(2x+y)平方-(2x+y)(2x-y)】除以2y-y
问题描述:
【(2x+y)平方-(2x+y)(2x-y)】除以2y-y
答
[(2x+y)的平方-(2x+y)(2x-y)]÷2y-y
=(4x^2+4xy+y^2-4x^2+y^2)÷2y-y
=(4xy+y^2)÷2y -y/2
=2x+y/2-y
=2x-y/2