展开 f(3x^2+2x+1)dx

解答

展开

f (3 x^{2} + 2 x + 1) d x

3 f x^{2} d x + 2 f x d x + fd x

求解步骤

f (3 x^{2} + 2 x + 1) d x

打开括号

= fd x \cdot 3 x^{2} + fd x \cdot 2 x + fd x \cdot 1

= 3 f x^{2} d x + 2 f x d x + 1 \cdot fd x

乘以:

1 \cdot f = f

= 3 f x^{2} d x + 2 f x d x + fd x

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