5x-8y=o,则(x+3y)/(x-3y)=_______
问题描述:
5x-8y=o,则(x+3y)/(x-3y)=_______
答
5x=8y
x=8y/5
原式=(8y/5+3y)(8y/5-3y)
=(23y/5)/(-7y/5)
=-23/7