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Í·Ò»´ÎÓÃmathtematica±àµÄ³ÌÐò£¬×ÜÊÇûÓл³öͼÐΣ¬²»ÖªµÀ´íÔÚʲôµØ·½ÁË£¬´óÅ£¿´Ò»Ï¡£ z1 = LaplaceTransform[Exp[-10*t - 5*t^2], t, s]; z2 = LaplaceTransform[(10 + 10*t)*Exp[-10*t - 5*t^2], t, s]; z3 = Simplify[z2]; equ1 = z1 + z3*y - z; y1 = LaplaceTransform[7*Exp[-7*t], t, s]; y2 = LaplaceTransform[110*Exp[-110*t], t, s]; equ2 = y1*x + y2*z - y; x1 = LaplaceTransform[120*Exp[-120*t], t, s]; equ3 = x1*y - x; Solve[{equ1 == 0, equ2 == 0, equ3 == 0}, {x, y, z}] m = InverseLaplaceTransform[z, s, t] Plot[z, {t, 0, 1}, PlotStyle -> {Red, Thickness[0.008]}] |
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xhw2211
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2Â¥2011-07-25 17:51:26
xhw2211
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xhw2211
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lot[m, {t, 0, 1}, PlotStyle -> {Red, Thickness[0.008]}]
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