化简求值:已知x-2y=2013,求【(3x+2y)(3x-2y)-(x+2y)(5x-2y)】/4x的值_数学解答

化简求值:已知x-2y=2013,求【(3x+2y)(3x-2y)-(x+2y)(5x-2y)】/4x的值

人气：446 ℃　时间：2019-09-22 04:34:15

解答

原式=（9x^2 - 4y^2 - 5x^2 - 8xy + 4y^2)/4x
= (4x^2 - 8xy )/4x
=4x (x-2y) /4x
=x-2y =2013