展开 (x+4)dx

解答

展开

(x + 4) d x

x d x + 4 d x

求解步骤

(x + 4) d x

使用分配律:

a (b + c) = ab + a c

a = d x, b = x, c = 4

= d xx + d x \cdot 4

= x d x + 4 d x

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