[(m+n)^2-4mn][(m-n)^2+4mn]+2(mn)^2
问题描述：
[(m+n)^2-4mn][(m-n)^2+4mn]+2(mn)^2
答
原式=(m²+2mn+n²-4mn)(m²-2mn+n²+4mn)+2m²n²=(m²-2mn+n²)(m²+2mn+n²)+2m²n²=[(m-n)(m+n)]²+2m²n²=(m²-n²)²+2m²n&...