数学试题讲解

下列反常积分发散的是

\int_{1}^{+ \infty} \frac{1}{x^{2}} d x

\int_{0}^{1} \frac{x d x}{\sqrt{1 - x^{2}}}

\int_{0}^{1} \frac{1}{\sqrt{x}} d x

\int_{1}^{+ \infty} \frac{1}{x \ln x} d x