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人気のある微分積分 >

integral of (7(x^2+5))/(x(x^2+7))

解

\int \frac{7 ( x ^{2} + 5 )}{x ( x ^{2} + 7 )} d x

解

ln x^{2} + 7 + 5 ln ∣ x ∣ + C

解答ステップ

\int \frac{7 ( x ^{2} + 5 )}{x ( x ^{2} + 7 )} d x

定数を除く:

\int a \cdot f (x) d x = a \cdot \int f (x) d x

= 7 \cdot \int \frac{x ^{2} + 5}{x ( x ^{2} + 7 )} d x

拡張

\frac{x ^{2} + 5}{x ( x ^{2} + 7 )} : \frac{x ^{2}}{x ( x ^{2} + 7 )} + \frac{5}{x ( x ^{2} + 7 )}

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

= 7 (\int \frac{x ^{2}}{x ( x ^{2} + 7 )} d x + \int \frac{5}{x ( x ^{2} + 7 )} d x)

\int \frac{x ^{2}}{x ( x ^{2} + 7 )} d x = \frac{1}{2} ln x^{2} + 7

\int \frac{5}{x ( x ^{2} + 7 )} d x = 5 (\frac{1}{7} ln ∣ x ∣ - \frac{1}{14} ln x^{2} + 7)

= 7 (\frac{1}{2} ln x^{2} + 7 + 5 (\frac{1}{7} ln ∣ x ∣ - \frac{1}{14} ln x^{2} + 7))

簡素化

7 (\frac{1}{2} ln x^{2} + 7 + 5 (\frac{1}{7} ln ∣ x ∣ - \frac{1}{14} ln x^{2} + 7)) : ln x^{2} + 7 + 5 ln ∣ x ∣

= ln x^{2} + 7 + 5 ln ∣ x ∣

定数を解答に追加する

= ln x^{2} + 7 + 5 ln ∣ x ∣ + C

グラフ

人気の例

面積 3x^3-x^2-10x,-x^2+2x,[-2,2]

a re a 3 x^{3} - x^{2} - 10 x, - x^{2} + 2 x, [- 2, 2]

integral from-2 to 0 of 2x^2+5x+6

\int_{- 2}^{0} 2 x^{2} + 5 x + 6 d x

derivative f(x)=-3/2 x^3+2/5 x^2-4

d er i v a t i v e f (x) = - \frac{3}{2} x^{3} + \frac{2}{5} x^{2} - 4

derivative g(t)= 7/(8t^5)

d er i v a t i v e g (t) = \frac{7}{8 t ^{5}}

integral of 3sin(6x)

\int 3 sin (6 x) d x