[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]÷4x.
问题描述:
[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]÷4x.
答
原式=[(9x2-4y2)-(5x2+8xy-4y2)]÷4x
=(4x2-8xy)÷4x
=x-2y.