数学试题讲解

下列反常积分收敛的是

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

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

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

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