integral from 1 to 2 of x^2(x-1)

解

\int_{1}^{2} x^{2} (x - 1) d x

\frac{17}{12}

十進法表記

1.41666 \dots

解答ステップ

\int_{1}^{2} x^{2} (x - 1) d x

拡張

x^{2} (x - 1) : x^{3} - x^{2}

= \int_{1}^{2} x^{3} - x^{2} d x

総和規則を適用する:

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

= \int_{1}^{2} x^{3} d x - \int_{1}^{2} x^{2} d x

\int_{1}^{2} x^{3} d x = \frac{15}{4}

\int_{1}^{2} x^{2} d x = \frac{7}{3}

= \frac{15}{4} - \frac{7}{3}

簡素化

\frac{15}{4} - \frac{7}{3} : \frac{17}{12}

= \frac{17}{12}