多项式3x^m-y^(n+2)+1/7x^(m-1)y(n+1)分解因式结果是_______

多项式3x^m-y^(n+2)+1/7x^(m-1)y(n+1)分解因式结果是_______
多项式3x^m-y^(n+2)+1/7x^(m-1)y(n+1)分解因式结果是_______

多项式3x^m-y^(n+2)+1/7x^(m-1)y(n+1)分解因式结果是_______
多项式3x^my^(n+2)+1/7x^(m-1)y(n+1)分解因式结果是:
3x^my^(n+2)+1/7x^(m-1)y(n+1)
=1/7x^(m-1)y^(n+1)(21xy+1)

（原题打字有误,多了个-,不能因式分解）

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