mathematica 解微分方程组In[39]:= DSolve[{x'[t] == r*x[t],x[0] == x0},x[t],t]During evaluation of In[39]:= DSolve::deqn:Equation or list of equations expected instead of True in the first argument {(x^\[Prime])[t]==r x[t],True}.>>Out[39]= DSolve

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