若多项式a减去4m-2n-1得m^2-7m+2n+ - 知识问答

若多项式a减去4m-2n-1得m^2-7m+2n+3,则多项式a=-----

3个回答

a-（4m-2n-1）＝m^2-7m+2n+3
a-4m+2n+1＝m^2-7m+2n+3
a=m^2-7m+2n+3-4m-2n-1
a=m^2-11m+2

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