展开 tU(t-2)

解答

展开

t U (t - 2)

t^{2} U - 2 t U

求解步骤

t U (t - 2)

使用分配律:

a (b - c) = ab - a c

t U (t - 2) = t U t - t U \cdot 2

= t U t - t U \cdot 2

化简

t U t - t U \cdot 2 : t^{2} U - 2 t U

= t^{2} U - 2 t U

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