计算m-n+[(2n²)/(m+n)]

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计算m-n+[(2n²)/(m+n)]计算m-n+[(2n²)/(m+n)]计算m-n+[(2n²)/(m+n)]原式=[(m-n)(m+n)+2n²]/(m+

计算m-n+[(2n²)/(m+n)]
计算m-n+[(2n²)/(m+n)]

计算m-n+[(2n²)/(m+n)]
原式=[(m-n)(m+n)+2n²]/(m+n)
=(m²-n²+2n²)/(m+n)
=(m²+n²)/(m+n)