基础 from sympy import * 数学格式输出: init_printing() 添加变量: x, y, z, a, b, c = symbols('x y z a b c') 声明分数: Rational(1, 3) \(\displaystyle \frac{1}{3}\) 化简式子: simplify((x**3 + x**2 - x - 1)/(x**2 + 2*x + 1)) \(\displaystyle x - 1\) 因式分解: expand((x + 2)*(x -