已知x-2y=3,则(2x+y-6)/(3x-y-9)=?
人气：115 ℃ 时间：2020-05-21 00:02:35
解答
x-2y=3
则：x=2y+3
代入原式,原式=(4y+6+y-6)/(6y+9-y-9)
=5y/5y
=1
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