最近在学习《Python数学编程》一书,第87页里面的一段代码

而我的却是这样的:
from sympy.abc import a, s, u, t
from sympy import solve
expr = u*t+1/2*a*t**2-s
solve(expr,t,dict = True)


from sympy.abc import a, s, u, t
from sympy import solve
expr = u*t+1/2*a*t**2-s
solve(expr,t,dict = True)

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