展开 (3t-1)dt

解答

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(3 t - 1) d t

3 t d t - d t

求解步骤

(3 t - 1) d t

使用分配律:

a (b - c) = ab - a c

a = d t, b = 3 t, c = 1

= d t \cdot 3 t - d t \cdot 1

= 3 t d t - 1 \cdot d t

乘以:

1 \cdot d t = d t

= 3 t d t - d t

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