微分 方程式
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sol = DSolveValue[y'[x] + y[x] == x, y[x], x] |
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sol /. C[1] -> 1 |
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DSolveValue[{y'[x] + y[x] == x, y[0] == -1}, y[x], x] |
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NDSolveValue[{y'[x] == Cos[x^2], y[0] == 0}, y[x], {x, -5, 5}] |
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Plot[%, {x, -5, 5}] |
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{xsol, ysol} = NDSolveValue[ {x'[t] == -y[t] - x[t]^2, y'[t] == 2 x[t] - y[t]^3, x[0] == y[0] == 1}, {x, y}, {t, 20}] |
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ParametricPlot[{xsol[t], ysol[t]}, {t, 0, 20}] |
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