{m-2/n=5,{2m+3n=12; 用代入消元法解这个方程组
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{m-2/n=5,{2m+3n=12; 用代入消元法解这个方程组
{m-2/n=5,{2m+3n=12; 用代入消元法解这个方程组
{m-2/n=5,{2m+3n=12; 用代入消元法解这个方程组
第一个得m=5+2/n
代入2
2(5+2/n)+3n=12化简
3n²-2n+4=0
无解
M=5+2/N代入2M+3N=12得10+4/N+3N=12化简得3N^2-2N+4=0即可解答
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