数学题(m-1)(m²+1)(m+1)-(m+1)²(m-1)²(m-1)(m²+1)(m+1)-(m+1)²(m-1)²

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数学题(m-1)(m²+1)(m+1)-(m+1)²(m-1)²
(m-1)(m²+1)(m+1)-(m+1)²(m-1)²

(m-1)(m²+1)(m+1)-(m+1)²(m-1)²
=(m-1)(m+1)(m^2+1-m^2+1)
=2(m-1)(m+1)
=2m^2-2