(2m+n)(4m^2-2mn+n^2)
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(2m+n)(4m^2-2mn+n^2)(2m+n)(4m^2-2mn+n^2) (2m+n)(4m^2-2mn+n^2)原式=8m^3+n^3这是立方和公式.(2m+n)(4m^2-2mn
(2m+n)(4m^2-2mn+n^2)
(2m+n)(4m^2-2mn+n^2)
(2m+n)(4m^2-2mn+n^2)
原式=8m^3+n^3
这是立方和公式.
(2m+n)(4m^2-2mn+n^2)
=8m^3-4m^2n+2mn^2+4m^2n-2mn^2+n^3(消去中间项)
=8m^3+n^3
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