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2分之x-3分之y=1 兩邊同乘以6得: 3x-2y=6(1) 3分之x+y=2分之y 兩邊同乘以6得: 2x+6y=3y 2x=-3y x=-3y/2(2) (2)代入(1)式得: -9y/2 -2y=6 -9y -4y=12 -13y=12 y=-12/13 x=-3y/2=36/13 x=36/13 y=-12/13
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