[bombcat]

试试这个
with(DEtools);
写一个方程，比如
eqn := diff(y(x), x) = 2*x+1
解
dsolve(eqn)
画图
DEplot(eqn, y(x), x = -3 .. 3, [[y(0) = 0], [y(0) = -2], [y(-1) = 2]], y = -3 .. 3, title = `1-rank differential equation`, color = red, linecolor = black)