化简:[(x+2y)^2-(x+y)(3x-y)-5y^2]/2x
问题描述:
化简:[(x+2y)^2-(x+y)(3x-y)-5y^2]/2x
答
[(x+2y)^2-(x+y)(3x-y)-5y^2]/2x
=[x^2+4xy+4y^2-3x^2-2xy+y^2-5y^2]/2x
=(-2x^2+2xy)/2x
=y-x