1. $\int \frac{1}{x(1+x)} dx =$
选项:
A:\[\ln{(x)}-\ln{\left( x+1\right) }+C\]
B:\[\ln{(x)}+\ln{\left( x+1\right) }+C\]
C:\[x-\ln{\left( x+1\right) }+C\]
D:\[-\ln{(x)}+\ln{\left( x+1\right) }+C\]
发布时间:2024-05-07 20:25:28