{(x+2y)(x-2y)-(x-2y)²}/2x_其他解答

{(x+2y)(x-2y)-(x-2y)²}/2x

人气：434 ℃　时间：2020-05-13 18:08:27

解答

{(x+2y)(x-2y)-(x-2y)²}/2x
=[ (x-2y) ( x+2y-x+2y) ] /2x
=(x-2y)4y/2x
=2y(x-2y) /x