求(m²+n²)²-[(-m)²-(-n)²]²的值,方法是平方差公逆用.急.

求(m²+n²)²-[(-m)²-(-n)²]²的值,方法是平方差公逆用.急.
求(m²+n²)²-[(-m)²-(-n)²]²的值,方法是平方差公逆用.急.

求(m²+n²)²-[(-m)²-(-n)²]²的值,方法是平方差公逆用.急.
(m²+n²)²-[(-m)²-(-n)²]²=(m²+n²)²-(m²-n²)²
=(m²+n²+m²-n²)[m²+n²-(m²-n²)]
=2m²*2n²
=4m²n²
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