展开 \delta(x)*(x-1)

解答

展开

δ (x) \cdot (x - 1)

x δ (x) - δ (x)

求解步骤

δ (x) (x - 1)

使用分配律:

a (b - c) = ab - a c

a = δ (x), b = x, c = 1

= δ (x) x - δ (x) \cdot 1

= x δ (x) - 1 \cdot δ (x)

乘以:

1 \cdot δ (x) = δ (x)

= x δ (x) - δ (x)

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