x方-y方/6x+9除以x+y/2x-6
问题描述：
x方-y方/6x+9除以x+y/2x-6
答
原式=[(x+y)(x-y)/3(2x+3)]×(2x-6)/(x+y)]
=(x-y)(2x-6)/3(2x+3)]
=(2x²-6x-2xy+6y)/(6x+9)