Ответ:
[tex]I=\frac{x^{2} }{2} +3x+10In|x+3|[/tex], С ∈ ℝ
Пошаговое объяснение:
[tex]I=\int\limits {\frac{x^{2}+1 }{x-3} } \, dx \\ \\I= \int\limits {x+3+\frac{10}{x-3} } \, dx \\ \\ I=\int\limits {x} \, dx +\int\limits {3} \, dx +\int\limits {\frac{10}{x-3} } \, dx \\ \\ I=\frac{x^{2} }{2} +3x+10In(|x-3|)\\ \\ I=\frac{x^{2} }{2} +3x+10In|x-3|[/tex]
[tex]\boxed{\boldsymbol{\displaystyle \int {\frac{x^{2} + 1}{x - 3} } \, dx = \frac{(x - 3)^{2}}{2} + 6(x - 3) + 10 \ln|x - 3| + C}}[/tex]
Примечание:
По таблице интегралов:
[tex]\boxed{\displaystyle \int x^{n} \ dx = \frac{x^{n + 1}}{n + 1} + C; n \neq -1, x > 0}[/tex]
[tex]\boxed{\displaystyle \int {\frac{1}{x} } \, dx = \ln|x| + C}[/tex]
По свойствам интегралов:
[tex]\boxed{ \displaystyle \int \sum\limits_{i=1}^n {C_{i}f_{i}(x)} \, dx = \sum\limits_{i=1}^nC_{i} \int {f_{i}(x)} \, dx}[/tex]
[tex]\displaystyle \int {\frac{x^{2} + 1}{x - 3} } \, dx =[/tex]
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Замена:
[tex]x - 3 = t \Longrightarrow dx = dt[/tex]
[tex]x = t + 3[/tex]
[tex]x^{2} = t^{2} + 6t + 9[/tex]
[tex]= \displaystyle \int {\frac{ t^{2} + 6t + 9 + 1}{t} } \, dt = \int {\frac{ t^{2} + 6t + 10}{t} } \, dt = \int { \bigg( \frac{ t^{2} }{t} + \frac{ 6t}{t} + \frac{ 10}{t} \bigg) } \, dt =[/tex]
[tex]\displaystyle = \int { \bigg( t+ 6 + \frac{10}{t} \bigg) } \, dt = \int {t} \, dt + \int {6} \, dt+ 10\int {\frac{1}{t}} \, dt =[/tex]
[tex]\displaystyle = \frac{t^{2}}{2} + C_{1} + 6t + C_{2} + 10\ln|t| + C_{3} = \frac{t^{2}}{2} + 6t + 10 \ln|t} + C =[/tex]
[tex]\displaystyle = \frac{(x - 3)^{2}}{2} + 6(x - 3) + 10 \ln|x - 3| + C[/tex]
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Answers & Comments
Ответ:
[tex]I=\frac{x^{2} }{2} +3x+10In|x+3|[/tex], С ∈ ℝ
Пошаговое объяснение:
[tex]I=\int\limits {\frac{x^{2}+1 }{x-3} } \, dx \\ \\I= \int\limits {x+3+\frac{10}{x-3} } \, dx \\ \\ I=\int\limits {x} \, dx +\int\limits {3} \, dx +\int\limits {\frac{10}{x-3} } \, dx \\ \\ I=\frac{x^{2} }{2} +3x+10In(|x-3|)\\ \\ I=\frac{x^{2} }{2} +3x+10In|x-3|[/tex]
Ответ:
[tex]\boxed{\boldsymbol{\displaystyle \int {\frac{x^{2} + 1}{x - 3} } \, dx = \frac{(x - 3)^{2}}{2} + 6(x - 3) + 10 \ln|x - 3| + C}}[/tex]
Примечание:
По таблице интегралов:
[tex]\boxed{\displaystyle \int x^{n} \ dx = \frac{x^{n + 1}}{n + 1} + C; n \neq -1, x > 0}[/tex]
[tex]\boxed{\displaystyle \int {\frac{1}{x} } \, dx = \ln|x| + C}[/tex]
По свойствам интегралов:
[tex]\boxed{ \displaystyle \int \sum\limits_{i=1}^n {C_{i}f_{i}(x)} \, dx = \sum\limits_{i=1}^nC_{i} \int {f_{i}(x)} \, dx}[/tex]
Пошаговое объяснение:
[tex]\displaystyle \int {\frac{x^{2} + 1}{x - 3} } \, dx =[/tex]
--------------------------------------------------------------------------------------------------------
Замена:
[tex]x - 3 = t \Longrightarrow dx = dt[/tex]
[tex]x = t + 3[/tex]
[tex]x^{2} = t^{2} + 6t + 9[/tex]
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[tex]= \displaystyle \int {\frac{ t^{2} + 6t + 9 + 1}{t} } \, dt = \int {\frac{ t^{2} + 6t + 10}{t} } \, dt = \int { \bigg( \frac{ t^{2} }{t} + \frac{ 6t}{t} + \frac{ 10}{t} \bigg) } \, dt =[/tex]
[tex]\displaystyle = \int { \bigg( t+ 6 + \frac{10}{t} \bigg) } \, dt = \int {t} \, dt + \int {6} \, dt+ 10\int {\frac{1}{t}} \, dt =[/tex]
[tex]\displaystyle = \frac{t^{2}}{2} + C_{1} + 6t + C_{2} + 10\ln|t| + C_{3} = \frac{t^{2}}{2} + 6t + 10 \ln|t} + C =[/tex]
[tex]\displaystyle = \frac{(x - 3)^{2}}{2} + 6(x - 3) + 10 \ln|x - 3| + C[/tex]