小弟敬请各位观看

xiaogui_zhou

<>咱的智力有限</P>
<>那位仁兄帮帮小弟解个微分方程组</P>
<>x'[t] == vx[t], y'[t] == vy[t], vx'[t] == -vx Sqrt[vx^2 + vy^2],
   vy'[t] == -vy Sqrt[vx^2 + vy^2], x[0] == 0, y[0] == 0, vx[0] ==
   180 Cos[Pi/6], vy == 180  Sin[Pi/180]</P>

xiaogui_zhou

最好用一下mathematica [em06][em07][em01]

hui533

我顶[em07]