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初中数学：解二元一次方程组，x+y=1，2x+4y=9，你用什么消元法？
初中数学：解二元一次方程组，x+y=1，2x+4y=9，你用什么消元法？
二元一次方程（组），三元一次方程组，应用题培优专题19/156
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