展开 (t-7)^2\H(t-7)

解答

展开

(t - 7)^{2} H (t - 7)

t^{2} H (t - 7) - 14 t H (t - 7) + 49 H (t - 7)

求解步骤

(t - 7)^{2} H (t - 7)

(t - 7)^{2} = t^{2} - 14 t + 49

= H (t - 7) (t^{2} - 14 t + 49)

= H (t - 7) (t^{2} - 14 t + 49)

打开括号

= H (t - 7) t^{2} + H (t - 7) (- 14 t) + H (t - 7) \cdot 49

使用加减运算法则

+ (- a) = - a

= t^{2} H (t - 7) - 14 t H (t - 7) + 49 H (t - 7)

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