[(x+2y)^2-(x-2y)^2-(x-2y)(x+2y)-4y^2]/2x 化简
问题描述:
[(x+2y)^2-(x-2y)^2-(x-2y)(x+2y)-4y^2]/2x 化简
答
[(x+2y)^2-(x-2y)^2-(x-2y)(x+2y)-4y^2]/2x
=[x^2+4xy+4y^2-(x^2-4xy+4y^2)-(x^2-4y^2)-4y^2]/2x
=(x^2+4xy+4y^2-x^2+4xy-4y^2-x^2+4y^2-4y^2)/2x
=(8y-x)/2