若x+2y=-1 2x-y=2求7x-y的值
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若x+2y=-1 2x-y=2求7x-y的值
若x+2y=-1 2x-y=2求7x-y的值
若x+2y=-1 2x-y=2求7x-y的值
由方程组解出x=3/5 y=-4/5 代入式子 7x-y得出5
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