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X = 1 - Y 所以X代入2x+y=3 得2(1 - Y)+y=3 2 - Y = 3 求得Y = -1 X = 2
把y=2x帶入第二個方程,即x+2x=3,解得x=1,再由第一個方程得y=2x=2,所以x=1,y =2
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