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数学：若(m²-9)x²+x-(m+3)y=0，是二元一次方程，怎么求m的值？
数学：若(m²-9)x²+x-(m+3)y=0，是二元一次方程，怎么求m的值？
二元一次方程（组），三元一次方程组，应用题培优专题30/156
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