关于∫e^xdx/(1+e^x),这一道微积分的计算我这样做对不对?∫e^xdx/(1+e^x)=∫d(1+e^x)/(1+e^x)=ln(1+e^x)+c书本上是这么做:∫e^xdx/(1+e^x)=∫(e^x+1-1)dx/(1+e^x)=∫(1-1/(1+e^x))de^x=e^x-ln(1+e^x)+c这么想对吗?d(1+e^x)=d
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![关于∫e^xdx/(1+e^x),这一道微积分的计算我这样做对不对?∫e^xdx/(1+e^x)=∫d(1+e^x)/(1+e^x)=ln(1+e^x)+c书本上是这么做:∫e^xdx/(1+e^x)=∫(e^x+1-1)dx/(1+e^x)=∫(1-1/(1+e^x))de^x=e^x-ln(1+e^x)+c这么想对吗?d(1+e^x)=d](/uploads/image/z/14716884-12-4.jpg?t=%E5%85%B3%E4%BA%8E%E2%88%ABe%5Exdx%2F%281%2Be%5Ex%29%2C%E8%BF%99%E4%B8%80%E9%81%93%E5%BE%AE%E7%A7%AF%E5%88%86%E7%9A%84%E8%AE%A1%E7%AE%97%E6%88%91%E8%BF%99%E6%A0%B7%E5%81%9A%E5%AF%B9%E4%B8%8D%E5%AF%B9%3F%E2%88%ABe%5Exdx%2F%281%2Be%5Ex%29%3D%E2%88%ABd%281%2Be%5Ex%29%2F%281%2Be%5Ex%29%3Dln%281%2Be%5Ex%29%2Bc%E4%B9%A6%E6%9C%AC%E4%B8%8A%E6%98%AF%E8%BF%99%E4%B9%88%E5%81%9A%EF%BC%9A%E2%88%ABe%5Exdx%2F%281%2Be%5Ex%29%3D%E2%88%AB%EF%BC%88e%5Ex%2B1-1%EF%BC%89dx%2F%281%2Be%5Ex%29%3D%E2%88%AB%281-1%2F%281%2Be%5Ex%29%29de%5Ex%3De%5Ex-ln%281%2Be%5Ex%29%2Bc%E8%BF%99%E4%B9%88%E6%83%B3%E5%AF%B9%E5%90%97%3Fd%281%2Be%5Ex%29%3Dd)
关于∫e^xdx/(1+e^x),这一道微积分的计算我这样做对不对?∫e^xdx/(1+e^x)=∫d(1+e^x)/(1+e^x)=ln(1+e^x)+c书本上是这么做:∫e^xdx/(1+e^x)=∫(e^x+1-1)dx/(1+e^x)=∫(1-1/(1+e^x))de^x=e^x-ln(1+e^x)+c这么想对吗?d(1+e^x)=d
关于∫e^xdx/(1+e^x),这一道微积分的计算我这样做对不对?
∫e^xdx/(1+e^x)=∫d(1+e^x)/(1+e^x)=ln(1+e^x)+c
书本上是这么做:
∫e^xdx/(1+e^x)=∫(e^x+1-1)dx/(1+e^x)=∫(1-1/(1+e^x))de^x=e^x-ln(1+e^x)+c
这么想对吗?d(1+e^x)=de^x=e^xdx
书本上是这么做:
∫e^xdx/(1+e^x)=∫(e^x+1-1)dx/(1+e^x)=∫(1-1/(1+e^x))de^x=e^x-ln(1+e^x)+c
我觉得这种做法应该错了
关于∫e^xdx/(1+e^x),这一道微积分的计算我这样做对不对?∫e^xdx/(1+e^x)=∫d(1+e^x)/(1+e^x)=ln(1+e^x)+c书本上是这么做:∫e^xdx/(1+e^x)=∫(e^x+1-1)dx/(1+e^x)=∫(1-1/(1+e^x))de^x=e^x-ln(1+e^x)+c这么想对吗?d(1+e^x)=d
你前面做的是对的.想的也是对的
下面书本上做的是错的.你可以求导回去.就会发现它不等于被积函数.
上面的是正确的解法
下面的计算错误了
其实两个方法都行
d(1+e^x)=de^x=e^xdx
这个等式是对的