二重积分的计算 —— 交换积分顺序(exchange the order of integration)
2017-07-20 15:50
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交换积分顺序的诀窍在数形结合;
先积 x,画横线(平行于 x 轴),右减左;
先积 y,画竖线(平行于 y 轴),上减下;
∫10∫ey1f(x,y)dxdy.
![](https://img-blog.csdn.net/20170720154542086?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvbGFuY2h1bmh1aQ==/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/SouthEast)
交换之后,先积 y 划竖线,上减下,则有:
∫e1{∫1lnxf(x,y)dy}dx
1. 几句顺口溜
后积先定限,限内穿条线,先交下限写,后交上限见先积 x,画横线(平行于 x 轴),右减左;
先积 y,画竖线(平行于 y 轴),上减下;
2. 简单举例
Examples of changing the order of integration in double integrals∫10∫ey1f(x,y)dxdy.
交换之后,先积 y 划竖线,上减下,则有:
∫e1{∫1lnxf(x,y)dy}dx
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