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(26)-高数8不定积分空白版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(一、二)全年智达班_{2}--资料
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(26)-高数8不定积分空白版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(一、二)全年智达班_{2}--资料
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(26)-高数8不定积分空白版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(一、二)全年智达班_{2}--资料
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(26)-高数8不定积分空白版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(一、二)全年智达班_{2}--资料
(26)-高数8不定积分空白版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(一、二)全年智达班_{2}--资料
(26)-高数8不定积分空白版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(一、二)全年智达班_{2}--资料
(26)-高数8不定积分空白版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(一、二)全年智达班_{2}--资料

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2025第六章 不定积分第一部分 知识点解析 一、原函数与不定积分的概念 1. 原函数 对  x  I ,都有 F  ( x ) = f ( x ) ,那么 F ( x ) 就称为 f ( x ) 在区 间 I 上的原函数. 2.原函数存在定理 连续函数必然存在原函数F(x). 如果函数 f ( x ) 在某 区间内存在第一类间断点及无穷间断点,则 f ( x ) 必不存在原函数;如 果 f (x)存在振荡间断点,则 f (x)可能存在原函数,也可能不存在原函 数.3.不定积分 求 f ( x ) 的全体原函数称为 f ( x ) 的不定积分,记作  f ( x ) d x = F ( x ) + C .二、基本积分表 (1) kdx = kx + C(k是常数) (3)  1 x d x = l n x + C (5)  a x d x = l a n x a + C (7) sin xdx = −cos x + C (9)  s i n 1 2 x d x =  c s c 2 x d x = − c o t x + C (2) 1 (11) dx = arcsin x + C 1− x2 (13)csc xcot xdx = −csc x + C , (15) cot xdx = ln | sin x | +C x d x 1 1 x 1 C , ( 1 )      = + + +  − (4)  e x d x = e x + C (6)  c o s x d x = s i n x + C 1 (8) dx = sec2 xdx = tan x + C cos2 x 1 (10) dx = arctan x + C 1+ x2 (12)  s e c x t a n x d x = s e c x + C (14) tan xdx = −ln | cos x | +C (16) sec xdx = ln | sec x + tan x | +C(17)  c s c x d x = l n | c s c x − c o t x | + C 1 1 x − a (19) dx = ln | | +C x2 − a2 2a x + a (21)  x d 2 x + a 2 = l n ( x + x 2 + a 2 ) + C (18)  a 2 1 + x 2 d x = 1 a a r c t a n x a + C (20)  a 2 1 − x 2 d x = a r c s i n x a + C dx (22) = ln | x + x2 − a2 | +C  x2 − a2三、不定积分的性质 性质 1   f ( x )  g ( x )  d x =  f ( x ) d x   g ( x ) d x . 性质 2  k f ( x ) d x = k  f ( x ) d x .四、凑微分法 f [ ( x ) ] ( x ) d x f [ ( x ) ] d ( x ) u ( x ) f ( u ) d u F ( u ) C F [ ( x ) ] C         =  =  = + = +五、换元积分法  f (x)dx =  f [(t)]d(t) =  f [(t)](t)dt . 常见的几种换元积分法 (1)如果 f ( x ) ax + b 含 n , cx + d n a x + b , n e a x + b 时,应将整个无理根式换元 成 t . (2)如果 f ( x ) 同时含 m a x + b 和 n a x + b p ,则应令t = ax + b , p 为 m , n 的 最小公倍数.(3).设 a  0 ,则 若 f ( x ) 有 a 2 − x 2 , 则令 x = a s i n t , 2 t 2   −   ; 若 f ( x ) 有 x 2 + a 2 , 则令 x = a t a n t   , −  t  ; 2 2 若 f ( x ) 有 x 2 − a 2 , 当 x  a 时,令 x = asect,其中 0 t 2    ; 当 x  a 时,先令 u = − x ,则 u  a ,再令u = asect 换元即可. 若有 ax2 + bx + c , 则应先配方成上述三种情形再做三角换元.六、分部积分法  u v  d x = u v −  u  v d x 或  u v  d x =  u d v = u v −  v d u . v类函数(积分) 中间类函数 u 类函数(求导) e a x , s i n a x , c o s a x , f (x)(在已知 f ( x ) 幂函数 x a , 多项式函数 时) P n ( x ) l n x , a r c t a n x , a r c s i n x , 变限积分类函数 x  f (t)dt a表格法:七、有理函数积分法 1.定义 形如积分  Q P n m ( ( x x ) ) d x =  b a m n x x n m + + a b n m − − 1 1 x x n m − 1 − 1 + + + + a b 1 1 x x + + a b 0 0 d x ,称为 有理函数的积分,如果 n  m P ( x) ,则 n 称为假分式;如果 Q ( x) m n  m ,则 Q P n m ( ( x x ) ) 称为真分式.二、有理函数的积分方法 核心思想——“拆”: step1. 如果 Q P n m ( ( x x ) ) 为假分式,先分解成“多项式+真分式”,分解方 法有两个:一个方法是拼凑法——分子拼凑出分母的因式后直接分 解;一个是利用多项式的长除法来进行分解.step2. 如果 Q P n m ( ( x x ) ) 为真分式,且分母 Q m ( x ) 可因式分解,则可将 Q P n m ( ( x x ) ) 继续分解成几个最简真分式之和,分解方法有两个, 一个方法是拼凑法;一个是用待定系数法按照如下拆分原则进行拆分: (1) 若Q (x)含因式 m ( a x + b ) ,则可分解出一项 a x A + b ; (2) 若Q (x)含因式 m ( a x + b ) k ,则可分解出 k 项 a x A + 1 b + ( a x A + 2 b ) 2 + + ( a x A + k b ) k ; (3) 若Q (x)含因式 m ( a x 2 + b x + c ) ,则可分解出一项 a x A 2 x + + b x B + c ; (4) 若Q (x)含因式(ax2 + bx + c)k ,则可分解出 m k 项: A x + B A x + B A x + B 1 1 + 2 2 + + k k . ax2 + bx + c (ax2 + bx + c)2 (ax2 + bx + c)k 然后解出待定系数,即可得到原真分式拆分的最简形式.第二部分、题型解析 题型一:关于原函数与不定积分的概念性质(★★) 解题思路——根据原函数、不定积分的概念求解.【例6.1】 设 f ( x ) =  c s o i n s x x , , x x   0 0 , g ( x ) =  x s i n 0 , 1 x , x x =  0 0 在区间(−1,1) 内( ). (A) f ( x ) 与 g(x)都存在原函数 (B) f ( x ) 与 g(x)都不存在原函数 (C) f ( x ) 存在原函数, g(x)不存在原函数 (D) f ( x ) 不存在原函数, g ( x ) 存 在原函数【例6.2】 已知函数 f ( x ) =  2 ( l n x − x , 1 ) , x x   1 1 ,则 f ( x ) 的一个原函数为 ( ). (A) F ( x ) =  ( x x ( l − n 1 x ) 2 − , 1 ) , x x   1 1 (B) F ( x ) =  ( x x ( l − n 1 x ) 2 + , 1 ) + 1 x , x   1 1 (C) F ( x ) =  ( x x ( l − n 1 x ) 2 + , 1 ) , x  x 1  1 (D) F ( x ) =  ( x x ( l − n 1 x ) 2 − , 1 ) + 1 , x x   1 1题型二:不定积分的计算(★★★★) 解题思路——考研试题一般不出技巧性很强的不定积分计算题目,而 是爱出综合计算题,即一道题中可能会涉及到凑微分法、换元积分 法、分部积分法、有理函数积分法中的多种计算方法,并且有一定的 计算量,所以务必要务必熟悉各种积分法及其适用的积分.【例6.3】 求不定积分  e x e x x − 1 d x【例6.4】 求不定积分  l n ( 1 + 1 + x x ) d x【例6.5】 计算不定积分  ( x 1 e + a r c x t a 2 n ) x 3 2 d x .【例6.6】 计算  3 2 2 − + x x  ( 2 − 1 x ) 2 d x .【例6.7】 计算不定积分  ( 2 2 x x 3 + + 1 3 ) x ( x 2 2 + + 4 x x + + 1 3 ) d x .【例6.8】 计算  ( 2 x + 1 ) d 3 x + 4 x − 4 x 2
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  1. CONNECT:[ UseTime:0.000488s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000672s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000268s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000285s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000468s ]
  6. SELECT * FROM `set` [ RunTime:0.000198s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.000538s ]
  8. SELECT * FROM `wendang` WHERE `id` = 327404 LIMIT 1 [ RunTime:0.000409s ]
  9. UPDATE `wendang` SET `liulancishu` = 3 WHERE `id` = 327404 [ RunTime:0.005769s ]
  10. UPDATE `wendang` SET `lasttime` = 1772081737 WHERE `id` = 327404 [ RunTime:0.000424s ]
  11. SELECT * FROM `wendang` WHERE `id` < 327404 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000456s ]
  12. SELECT * FROM `wendang` WHERE `id` > 327404 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000408s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 327404 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002749s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 327404 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002662s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 327404 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.009446s ]
0.098660s