计算:(m+n)(m-n)[mn-(m+n)²][(m-n)²+mn]
问题描述:
计算:(m+n)(m-n)[mn-(m+n)²][(m-n)²+mn]
答
(m+n)(m-n)[mn-(m+n)²][(m-n)²+mn] = (m+n)(m-n)(-m^2—mn—n^2)(m^2—mn+n^2)
=-(m-n)(m^2+mn+n^2)(m+n)(m^2—mn+n^2)= -(m^3-n^3)(m^3+n^3)=-(m^6-n^6)=n^6-m^6
答
:(m+n)(m-n)[mn-(m+n)²][(m-n)²+mn]=(m+n)(m-n)[mn-(m²+2mn+n²)(m²-2mn+n²+mn)=-(m+n)(m²-mn+n²)(m-n)(m²+mn+n²)=-(m³+n³)(m³-n³)=-(m^6-n...