要替换几个值：
>>> from sympy import Symbol>>> x, y = Symbol('x y')>>> f = x + y>>> f.subs({x:10, y: 20})>>> f30
要替换几个值：
>>> from sympy import Symbol>>> x, y = Symbol('x y')>>> f = x + y>>> f.subs({x:10, y: 20})>>> f30名师互学网 版权所有 (c)2021-2022 ICP备案号：晋ICP备2021003244-6号
