integral from 0 to 4 of (5x-x^2)-x

解答

\int_{0}^{4} (5 x - x^{2}) - x d x

\frac{32}{3}

十进制

10.66666 \dots

求解步骤

\int_{0}^{4} 5 x - x^{2} - x d x

化简

= \int_{0}^{4} - x^{2} + 4 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_{0}^{4} x^{2} d x + \int_{0}^{4} 4 x d x

\int_{0}^{4} x^{2} d x = \frac{64}{3}

\int_{0}^{4} 4 x d x = 32

= - \frac{64}{3} + 32

化简

- \frac{64}{3} + 32 : \frac{32}{3}

= \frac{32}{3}

f (x) = 2 x^{2} e^{x}

\frac{d ^{2}}{d x ^{2}} (\frac{1}{1 + x})

\frac{d}{d x} (\frac{cos ( x )}{e ^{2 x}} - 2)

y^{^{'}} + \frac{1}{x} y = 2

n \to \infty lim ((\frac{4}{5})^{n})