quadratically integrable function

例句：

1. 1. The quadratic equation has a solution that can be expressed in terms of the roots.
   二次方程有一个解可以表示为根的形式。
2. 2.The quadratic formula is used to solve equations involving squares and roots.
   二次公式用于解决涉及平方和根的方程。
3. 3.The quadratic equation is a type of polynomial equation that involves two variables and their squares.
   二次方程是一种包含两个变量及其平方的多项式方程。