化简-(m-n)^2+(n-m)^2-mn

解答

化简

- (m - n)^{2} + (n - m)^{2} - mn

- mn

求解步骤

- (m - n)^{2} + (n - m)^{2} - mn

展开

- (m - n)^{2} : - m^{2} + 2 mn - n^{2}

= - m^{2} + 2 mn - n^{2} + (n - m)^{2} - mn

展开

(n - m)^{2} : n^{2} - 2 mn + m^{2}

= - m^{2} + 2 mn - n^{2} + n^{2} - 2 mn + m^{2} - mn

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