展开 L(42t+21)\H(t-1)

解答

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L (42 t + 21) H (t - 1)

42 L t H (t - 1) + 21 L H (t - 1)

求解步骤

L (42 t + 21) H (t - 1)

= L H (t - 1) (42 t + 21)

使用分配律:

a (b + c) = ab + a c

a = L H (t - 1), b = 42 t, c = 21

= L H (t - 1) \cdot 42 t + L H (t - 1) \cdot 21

= 42 L t H (t - 1) + 21 L H (t - 1)

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