如果2m-3n=2 m+2m=1,那么3m-n+3=?

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如果2m-3n=2 m+2m=1,那么3m-n+3=?

如果2m-3n=2 m+2m=1,那么3m-n+3=?
如果2m-3n=2 m+2m=1,那么3m-n+3=?

如果2m-3n=2 m+2m=1,那么3m-n+3=?
2m-3n=2 m+2n=1 两式相加:3m-n=3 所以3m-n+3=3+3=6