integral from 1 to 4 of (4x^2+sqrt(x))

解答

\int_{1}^{4} (4 x^{2} + x) d x

\frac{266}{3}

十进制

88.66666 \dots

求解步骤

\int_{1}^{4} 4 x^{2} + x d x

使用积分加法定则:

\int f (x) \pm g (x) d x = \int f (x) d x \pm \int g (x) d x

= \int_{1}^{4} 4 x^{2} d x + \int_{1}^{4} x d x

\int_{1}^{4} 4 x^{2} d x = 84

\int_{1}^{4} x d x = \frac{14}{3}

= 84 + \frac{14}{3}

化简

84 + \frac{14}{3} : \frac{266}{3}

= \frac{266}{3}

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