展开 (2mL-k+t^2)^2

解答

展开

(2 m L - k + t^{2})^{2}

4 L^{2} m^{2} - 4 L km + 4 L m t^{2} + k^{2} - 2 k t^{2} + t^{4}

求解步骤

(2 m L - k + t^{2})^{2}

= (2 L m - k + t^{2})^{2}

(2 m L - k + t^{2})^{2} = (2 m L - k + t^{2}) (2 m L - k + t^{2})

= (2 L m + t^{2} - k) (2 L m + t^{2} - k)

乘开

(2 m L - k + t^{2}) (2 m L - k + t^{2}) : 4 L^{2} m^{2} - 4 L km + 4 L m t^{2} + k^{2} - 2 k t^{2} + t^{4}

= 4 L^{2} m^{2} - 4 L km + 4 L m t^{2} + k^{2} - 2 k t^{2} + t^{4}

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