字寫的不好 湊活看一下家人們，重要的是看一下參數(shù)方程怎么列二重積分的思路

核心在于假裝知道，裝不下去了直接代換

湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)湊字數(shù)