(x+y+4)/3=(3x+2y)/4=(2x+y)/5
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(x+y+4)/3=(3x+2y)/4=(2x+y)/5
![(x+y+4)/3=(3x+2y)/4=(2x+y)/5](/uploads/image/z/16710957-45-7.jpg?t=%28x%2By%2B4%29%2F3%3D%283x%2B2y%29%2F4%3D%282x%2By%29%2F5)
(x+y+4)/3=(3x+2y)/4①
(x+y+4)/3=(2x+y)/5②
整理得:
5x+2y=16③
x-2y=20④
③+④,得
x=6
把x=6代入④,得
y=-7
∴{x=6
y=-7
(x+y+4)/3=(2x+y)/5②
整理得:
5x+2y=16③
x-2y=20④
③+④,得
x=6
把x=6代入④,得
y=-7
∴{x=6
y=-7
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