2.5(X+Y)=1200 10/3(X-Y)=1200
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2.5(X+Y)=1200 10/3(X-Y)=1200
(x+y)=1200/2.5=480
(x-y)=1200/(10/3)=360
1+2式
2x=840
x=420
代入y=60
(x-y)=1200/(10/3)=360
1+2式
2x=840
x=420
代入y=60
2.5(X+Y)=1200 10/3(X-Y)=1200
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