∵X+Y＝250 ∴X=250-Y 将其带入原方程得
1.1（250-Y）+1.2Y=280
解得Y=50
∴X=250-Y
=250-50
=200
则原方程的X=200 Y=50.
X+Y＝2501.1X+1.2Y＝280
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