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受欢迎的微积分 >

integral of 1/(\sqrt[3]{x)+\sqrt[4]{x}}

解答

\int \frac{1}{3 x + 4 x} d x

解答

12 (\frac{1}{8} x^{\frac{2}{3}} - \frac{1}{7} x^{\frac{7}{12}} + \frac{1}{6} x - \frac{1}{5} x^{\frac{5}{12}} + \frac{1}{4} 3 x - \frac{1}{3} 4 x + \frac{1}{2} 6 x - 12 x + ln 12 x + 1) + C

求解步骤

\int \frac{1}{3 x + 4 x} d x

使用换元积分法

= \int \frac{12 u ^{8}}{u + 1} d u

提出常数:

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

= 12 \cdot \int \frac{u ^{8}}{u + 1} d u

长除

\frac{u ^{8}}{u + 1} : u^{7} - u^{6} + u^{5} - u^{4} + u^{3} - u^{2} + u - 1 + \frac{1}{u + 1}

= 12 \cdot \int u^{7} - u^{6} + u^{5} - u^{4} + u^{3} - u^{2} + u - 1 + \frac{1}{u + 1} d u

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

= 12 (\int u^{7} d u - \int u^{6} d u + \int u^{5} d u - \int u^{4} d u + \int u^{3} d u - \int u^{2} d u + \int u d u - \int 1 d u + \int \frac{1}{u + 1} d u)

\int u^{7} d u = \frac{u ^{8}}{8}

\int u^{6} d u = \frac{u ^{7}}{7}

\int u^{5} d u = \frac{u ^{6}}{6}

\int u^{4} d u = \frac{u ^{5}}{5}

\int u^{3} d u = \frac{u ^{4}}{4}

\int u^{2} d u = \frac{u ^{3}}{3}

\int u d u = \frac{u ^{2}}{2}

\int 1 d u = u

\int \frac{1}{u + 1} d u = ln ∣ u + 1 ∣

= 12 (\frac{u ^{8}}{8} - \frac{u ^{7}}{7} + \frac{u ^{6}}{6} - \frac{u ^{5}}{5} + \frac{u ^{4}}{4} - \frac{u ^{3}}{3} + \frac{u ^{2}}{2} - u + ln ∣ u + 1 ∣)

u = 12 x

代回

= 12 (\frac{( 12 x ) ^{8}}{8} - \frac{( 12 x ) ^{7}}{7} + \frac{( 12 x ) ^{6}}{6} - \frac{( 12 x ) ^{5}}{5} + \frac{( 12 x ) ^{4}}{4} - \frac{( 12 x ) ^{3}}{3} + \frac{( 12 x ) ^{2}}{2} - 12 x + ln 12 x + 1)

化简

12 (\frac{( 12 x ) ^{8}}{8} - \frac{( 12 x ) ^{7}}{7} + \frac{( 12 x ) ^{6}}{6} - \frac{( 12 x ) ^{5}}{5} + \frac{( 12 x ) ^{4}}{4} - \frac{( 12 x ) ^{3}}{3} + \frac{( 12 x ) ^{2}}{2} - 12 x + ln 12 x + 1) : 12 (\frac{1}{8} x^{\frac{2}{3}} - \frac{1}{7} x^{\frac{7}{12}} + \frac{1}{6} x - \frac{1}{5} x^{\frac{5}{12}} + \frac{1}{4} 3 x - \frac{1}{3} 4 x + \frac{1}{2} 6 x - 12 x + ln 12 x + 1)

= 12 (\frac{1}{8} x^{\frac{2}{3}} - \frac{1}{7} x^{\frac{7}{12}} + \frac{1}{6} x - \frac{1}{5} x^{\frac{5}{12}} + \frac{1}{4} 3 x - \frac{1}{3} 4 x + \frac{1}{2} 6 x - 12 x + ln 12 x + 1)

解答补常数

= 12 (\frac{1}{8} x^{\frac{2}{3}} - \frac{1}{7} x^{\frac{7}{12}} + \frac{1}{6} x - \frac{1}{5} x^{\frac{5}{12}} + \frac{1}{4} 3 x - \frac{1}{3} 4 x + \frac{1}{2} 6 x - 12 x + ln 12 x + 1) + C

作图

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