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一、概念的引入

一、概念的引入. 实例. 所谓曲面光滑即曲面上各点处都有切平面 , 且当点在曲面上连续移动时 , 切平面也连续转动. 分割. 取近似. 求和. 取极限. 三、化第一类曲面积分为二重积分. 第一类曲面积分的 性质. 特别 ，. 则. 一投：. 二换：. 三代：. 则. 一投：. 二换：. 三代：. 例 3. 解. 例 4. 解. 所以，. 例 5. 解. 例 6. 解 :.

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一、概念的引入

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  1. 一、概念的引入 实例 所谓曲面光滑即曲面上各点处都有切平面,且当点在曲面上连续移动时,切平面也连续转动.

  2. 分割 取近似 求和 取极限

  3. 三、化第一类曲面积分为二重积分

  4. 第一类曲面积分的性质 特别，

  5. 则 一投： 二换： 三代：

  6. 则 一投： 二换： 三代：

  7. 例3 解

  8. 例4 解

  9. 所以，

  10. 例5 解

  11. 例6 解:

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