(2m+n)(4m^2-2mn+n^2)
[(m+n)^2-4mn][(m-n)^2+4mn]+2(mn)^2
3(m^2n+mn)-4(mn-2m^2n)+mn.
因式分解: m(m-2n)+n(2mn-m^2)
mn(m-n)-m(n-m)2 2是平方
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