整式a与m^2-2mn+3*n^2的和是(m-2n)^2,求多项式a
1个回答
a+m^2-2mn+3n^2=m^2-4mn+4n^2,移项、合并同类项得:a=n^-2mn
所以,所求多茂式a为n^-2mn.
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