[(2X+Y)*(2X+Y)-Y(Y+4X)]/2X 怎么算?
问题描述:
[(2X+Y)*(2X+Y)-Y(Y+4X)]/2X 怎么算?
答
[(2X+Y)*(2X+Y)-Y(Y+4X)]/2X
=(4x2(平方)+4xy+y2-y2-4xy)/2x
=4x2/2x
=2x