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(33)-高数17二重积分笔记版_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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(33)-高数17二重积分笔记版_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
(33)-高数17二重积分笔记版_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
(33)-高数17二重积分笔记版_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
(33)-高数17二重积分笔记版_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
(33)-高数17二重积分笔记版_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
(33)-高数17二重积分笔记版_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
(33)-高数17二重积分笔记版_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
(33)-高数17二重积分笔记版_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
(33)-高数17二重积分笔记版_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
(33)-高数17二重积分笔记版_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
(33)-高数17二重积分笔记版_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
(33)-高数17二重积分笔记版_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
(33)-高数17二重积分笔记版_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
(33)-高数17二重积分笔记版_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
(33)-高数17二重积分笔记版_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
(33)-高数17二重积分笔记版_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
(33)-高数17二重积分笔记版_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
(33)-高数17二重积分笔记版_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
(33)-高数17二重积分笔记版_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
(33)-高数17二重积分笔记版_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
(33)-高数17二重积分笔记版_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
(33)-高数17二重积分笔记版_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
(33)-高数17二重积分笔记版_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
(33)-高数17二重积分笔记版_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
(33)-高数17二重积分笔记版_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
(33)-高数17二重积分笔记版_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
(33)-高数17二重积分笔记版_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
(33)-高数17二重积分笔记版_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
(33)-高数17二重积分笔记版_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
(33)-高数17二重积分笔记版_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
(33)-高数17二重积分笔记版_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
(33)-高数17二重积分笔记版_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
(33)-高数17二重积分笔记版_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
(33)-高数17二重积分笔记版_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第十一章 二重积分第二部分、题型解析 题型一:二重积分的概念与性质(★★★) 一、二重积分的定义 FN1)30 1. 二重积分的几何意义  f ( x, y)d为曲顶柱体体积的代数和. D " 2. 二重积分的物理意义 设区域D为一平面薄片,其面密度为 f (x, y),则 f ( x, y)d表示平面薄片质量的代数和. D "D二、二重积分的性质: 性质 3 二重积分的比较定理 定理 1 (x, y) D若 f (x, y)  g(x, y)则 f (x, y)d  g(x, y)d. D D 定理 2 如果在D内 f (x, y)  0且D  D 则 f (x, y)d  f (x, y)d. 1 2 D D 1 2 性质 4  1d = S , 其中S 为区域 D D D D 的面积. 性质 7 二重积分的积分中值定理 设函数 f (x, y)在闭区域 D上连续 则在 D上至少存在一点(,)使得 f (x, y)d = f (,)S  D D三、二重积分的对称性质 1. 奇偶对称性 (1)若D关于 x 轴对称,D 为 1 D XY - 的上半部分,则 VX  0, f (x,− y) = − f (x, y)   f (x, y)d=  . 2 f (x, y)d, f (x,− y) = f ( x, y)  D  D 1 (2)若D关于 y轴对称, D 为D的右部分,则 1  0, f (− x, y) = − f (x, y)   f (x, y)d=  . 2 f (x, y)d, f (− x, y) = f (x, y)  D  D 1 C(3)若D关于原点对称,设D 为 1 D 的上半平面或右半平面,则 ( ) ( )  0, f − x,− y = − f x, y  ( )  f x, y d=  . ( ) ( ) ( ) 2 f x, y d, f − x,− y = f x, y  D  D 1 ↑ - S (-X - y) . .2. 轮换对称性 如果D关于 y = x对称,则 f (x, y)d =  f ( y, x)d. D D fixm) = axay fixay it 解题思路——小题居多,往往利用二重积分的概念、性质、对称性、 二重积分中值定理等方法解决. Y X = / x = 1 y + ↳ / fixmaxay / filxlaxay X = 0 = D y = 0 &【例11.1】 设D 是圆域D = {(x, y) | x 2 + y 2  1}的第 k k 象限的部分,记 I =  ( y − x)dxdy,则( B ). k D k (A)I  0 (B)I  0 (C)I  0 (D)I  0 1 2 3 4 y X = ↑ Da 1 x0ey) xE) - V Da Di i - V !1-xiaxay & In > 0 = Ds D4【例11.2】 设D = {(x, y) | −ln x  y  ln x,1  x  e}, f (x)是连续的奇 函数, g(x)是连续的偶函数,下列正确的选项是( A ). (A)  f ( y)g( x)dxdy = 0 (B)  f (x)g( y)dxdy = 0 D D (C) [ f ( x) + g( y)]dxdy = 0 (D) [ f ( y) + g( x)]dxdy = 0. D D Y JE = InX DIA ↑ , I f(-y) f(y) fiylgaxay (A) . 91x) = - . 9) = 0 =2 , 3 f(x fix (B) 959) q() F4 . = . I . f(x) (c) f(x) + 91 - y) = + 91) m Y InX = - f( f(y) (P) -y) + 9(x) = - + 9) FYEH↑ ( ) 2 2 【例11.3】 设I =  ln 1 + x 2 + y 2 dxdy,I =  (e x + y − 1)dxdy, 1 2 D D I =  arctan( x 2 + y 2 )dxdy,且D = {(x, y) | x 2 + y 2  1},则( B ). 3 D (A)I  I  I (B) I  I  I (C) I  I  I (D)I  I  I 3 2 1 1 3 2 2 3 1 1 2 3 B 0 = t = E + Y = / #J In (1 ++) et-1 arseat . . , flo) / fit) In C t)-arctat = + = o , fith it I oct 21 AJ It CHE fitt find = = 0 , , It , fitl flo Infitel : - = 0 : = arctet& et-1-arstit 910) git) = 0 = , 1 ↑ git et 30 914 - = , I It / = 0.e-13 911 90) , astant : > =【例11.4】 设区域D = {(x, y) x 2 + y 2  4, x  0, y  0}, f (x)为D上的 a f ( x) + b f ( y) 正值连续函数,a,b为常数,则 d =( 1 ). f (x) + f ( y) D ab a + b (A)ab. (B) . (C)(a + b). (D) . 2 2 a fix th fill a E Fab ↑ y =X 1. at F Fy) + 2 b = + / ) 21 :. art . # Fy) + cat Fin I + b) x(xyx2) dr ( (a b)7 = = + = + # + 4) a+ b = I T = 2【例11.5】 设函数 f (x, y)在D = {(x, y) | x 2 + y 2  r 2 }上连续,且 r  f (x, y)dxdy D f (0,0) = 2.那么lim r = . ↑ r2 r→0 EY)ED SE (5 # ↑ r 4) , · . - N & f( ↓ fixlaxay ? ) xr , = ) M = I T ~ = floo i 272 = =题型二:交换积分次序(★★★) 解题思路——当题目要求将累次积分换序,或者累次积分在当前积 分次序下计算不出来时,要想到交换积分次序,其步骤为: 1. 画出积分区域:先画后积的累次积分的区域,再画先积的累次积 分的区域,两者相交部分即为积分区域 D . 2. 交换积分次序之后,重新写出累次积分.2 x+2 【例11.6】 设 f (x, y)是连续函数,则二次积分 dx f (x, y)dy等于 2 −1 x ( ). B 2 y+2 1 y 4 y (A) dy f ( x, y)dx (B) dy f (x, y)dx +  dy f (x, y)dx 2 −1 y 0 − y 1 y−2 2 y 4 y (C) dy f (x, y)dx +  dy f (x, y)dx x y = x+ 2 0(2 , 4) 0 0 2 y−2 i S 2 y 4 y−2 (D) dy f (x, y)dx +  dy f (x, y)dx 1 1 2 1 (1) - ---D-y---y = x = S 75 /1 fixy) axay Y = ic I - Day 1ayfixmax fixm)ax + =1 1 【例11.7】 计算 dy x3 + 1dx =_________. 0 y ↑ TB / (1 1) Y= x 1 axay . = + A -= y - / * 11(p)x= (jax/ x ay +1 = 3 . N ( x ax = . / ! d(x 1) + = (E) =(E +x 1) = - =题型三:二重积分的计算(★★★★★) 1. X −型区域下二重积分的计算 第一步(先积 y)作一条直线自下而上穿过 D ,穿入作  (x) 下限,穿出作上限得 2 f (x, y)dy.  (x) 1 第二步(再积 x )再继续从 a 到 b 积分对 x 积分,则 b  (x)  f (x, y)d=  dx 2 f (x, y)dy. a  (x) 1 D2. Y −型区域下二重积分的计算 第一步(先积 x )作一条直线自左向右穿过D,穿入作  ( y) 下限,穿出作上限得 2 f (x, y)dx.  ( y) 1 第二步(再积 y)再继续从 c 到 d 积分对 y 79 积分,即 d  ( y)  f (x, y)d=  dy 2 f (x, y)dx. c  ( y) 1 D3. 利用极坐标计算二重积分 当积分区域为圆形区域或者环形区域 2 2 时,或被积函数为 f (x + y )时,考虑用极坐标系积分. 在极坐标下, x = cos, y = sin,d= dd. 第一步(先积):从极点引一条射线穿过 D D ,穿入作下限,穿出作上  () 限得 2 f (cos,sin)d.  () 1 第二步(再积):再继续从到对积分, 于是   ()  f (x, y)d=  d 2 f (cos,sin)d   () 1 D4.平面薄片的质心 设平面薄片的质心坐标为(x, y),面密度为 (x, y),则质心公式:  x(x, y)d  y(x, y)d x = D  y = D   (x, y)d  ( x, y)d D D 5.平面薄片的形心 设平面薄片的形心坐标为(x, y),则平面薄片的形 心公式:  xd  xd  yd  yd x = D = D  y = D = D  1d S 1d S D D D D xar 14 ar Sp E y Se = . = .解题思路——二重积分的计算步骤如下: 1. 先画出积分区域. 2. 根据积分区域的特点,利用奇偶对称性、轮换对称性或者换元进行 化简. 3. 选用合适的坐标系及积分次序进行积分. 如果是 X −型区域或Y −型 区域可以选用直角坐标系积分,注意选择积分序是先考虑积分区域积 分的便利性,再考虑被积函数积分的便利性;如果积分区域由圆或圆 2 2 环类曲线组成或被积函数为 f (x + y ),则可用极坐标积分. 【例11.8】 设 D 是由曲线 y = sin x, y = 1, x = − 围成的闭区域, 计算 2 ( ) 2 2  1 + ye−x −y sin xdxdy.. " 1 D y= N EFAME Y WEE O] rD D21 &/ -D-i < =- SMX IlD . . S I Da > - * D 5 D2 X = , Ex = / (smx+ Smx y axoy T . . X=- z * -dxy + (snx+ Sax . y . E 2 suxay + 2 dX suxaxay suxaay = o = = 2/ 2/itsm/dx xz - Smijax -2x + = = - = =  【例11.9】 已知平面区域D = (x, y) | y − 2 x 4 − y2 ,0 y 2 , 计算 (x − y)2 N c+ = I =  dxdy. 2 y 4 P x2 + y2 = Sho-10Y = X+2 D (P 2) Di = Da + = 2 xay xay I Fas a pa pa 1050-2cocosmotshal do 1 2 2 =n + C-oSO-SMO( dO 010) CSO+ - = 27 - 2 .【例11.10】 设有界区域由直线 y = 1, y = x, y = − x围成,计算二重积分 2 2 x − xy − y ↑  dxdy. x 2 + y 2 ( ll 4 = 1 (11) . D & - - y Di (x - 73 = - Plaxay y =-X T yY =X - x y2 Y 2/ X 2 avay 0 = - = xay Elaxay 4x axay (1 1 = 2 - = - 4/jay/ 4) y2 arctat ? 75 35 - : = 1 - dX = 1- any (64 ( 01dy - = 1 4 . - = 135 X = = ↑ ( ll 4 = 1 (11) . 4/axay 7 1 -> = - - Di - y =-X y =X T 4) also so 1 e = - 2 y 1 = so El PsnO = 1 / 1 = - E1 sud = sto R laz I = -- 00 1 -2 S-m = do & sio - - = .题型四:分段函数的二重积分(★★★)  f (x, y), (x, y) D 1 1 解题思路——如果被积函数 f (x, y) = 为二元分段  f (x, y), ( x, y) D  2 2 函数,其中D D = D,则 1 2  f (x, y)d=  f (x, y)d+  f (x, y)d. 这种分段函数的二重积分 1 2 D D D 1 2 关键在于要在D内找到 f (x, y)的分界线,从而对 D 正确的划分成D 和 1 D 然后分别积分. 22 2 【例11.11】 计算二重积分  e max{x ,y } dxdy,其中 D D = {(x, y) | 0  x  1,0  y  1} (1 1) X . I y=X etay * u2 x emaxixinaxay = + ↓ , e axay i D2 ** 42 D = & * etaxay Ferixyl & e axy I 73 21 evaxay So ax ( + * lo1 exxax 2 2 = = = e ay * =a e x =【例11.12】 设D = {(x, y) | x2 + y2  2, x  0, y  0},[1+ x 2 + y 2 ]表示 不超过1+ x 2 + y 2 的最大整数,计算  xy[1 + x 2 + y 2 ]dxdy. D 0 =E +Y HE DIA 1 = H = Y + [ , , Xya/ =H Y P In + ] I 1, + 2 E) 0 : , L : = Dxty =1 HY HE1EXTME Dz 2 = 3 2 , TB /47 This 1144 Ex y') = · axay + . + axay 1 x4 axay 112xY axy + = , do ↳ not piosopshopap I I + 2 Posopso Pap , = E k + =
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  4. 会话信息 : SESSION_ID=840fcb6c31e1f3bdde1aad1900f72cf0
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  1. CONNECT:[ UseTime:0.000598s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000851s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000297s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.004567s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000590s ]
  6. SELECT * FROM `set` [ RunTime:0.000650s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.000621s ]
  8. SELECT * FROM `wendang` WHERE `id` = 327419 LIMIT 1 [ RunTime:0.008005s ]
  9. UPDATE `wendang` SET `liulancishu` = 3 WHERE `id` = 327419 [ RunTime:0.005401s ]
  10. UPDATE `wendang` SET `lasttime` = 1772162237 WHERE `id` = 327419 [ RunTime:0.000490s ]
  11. SELECT * FROM `wendang` WHERE `id` < 327419 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000522s ]
  12. SELECT * FROM `wendang` WHERE `id` > 327419 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000432s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 327419 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000456s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 327419 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000876s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 327419 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002299s ]
0.094149s