(x+y)/2+(x-y)/3=6 2(x+y)-3x+3y=24 过程
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(x+y)/2+(x-y)/3=6 2(x+y)-3x+3y=24 过程
(x+y)/2+(x-y)/3=6 2(x+y)-3x+3y=24 过程
(x+y)/2+(x-y)/3=6 2(x+y)-3x+3y=24 过程