mathematica不能画图

in[1} := s1 =
parametricPlot3D[{u, v, sprt (1 - (u^2 + v^2))}, {u, 0, 1}, {v, -1,
1}, Plotrange \[RightArrow] {0, 1},
AxesLabel \[RightArrow] {"X", "Y", "Z"},
DisplayFunction\[LongRightArrow]Identity];
s2 = parametricPlot3D[{u - u^2, u^2, v}, {u, 0, 1}, {v, 0, 1},
Plotrange \[RightArrow] {0, 1},
AxesLabel \[RightArrow] {"X", "Y", "Z"},
DisplayFunction\[LongRightArrow]Identity];
s3 = parametricPlot3D[{u, v, 0}, {u, 0, 1}, {v, -1, 1},
Plotrange \[RightArrow] {0, 1},
AxesLabel \[RightArrow] {"X", "Y", "Z"},
DisplayFunction\[LongRightArrow]Identity];
out[1] = show[s1, s2, s3,
DisplayFunction \[RightArrow] $DisplayFunction]

为什么不出现图形呢？

s1 = ParametricPlot3D[{u, v, Sqrt[1 - (u^2 + v^2)]}, {u, 0, 1}, {v, -1, 1}];
s2 = ParametricPlot3D[{u - u^2, u^2, v}, {u, 0, 1}, {v, 0, 1}];
s3 = ParametricPlot3D[{u, v, 0}, {u, 0, 1}, {v, -1, 1}];
Show[s1, s2, s3, PlotRange -> {0, 1}, AxesLabel -> {"X", "Y", "Z"}]

也太多错误了吧 s1 = ParametricPlot3D[{u, v, Sqrt [1 - (u^2 + v^2)]}, {u, 0, 1}, {v, -1, 1}, PlotRange -> {0, 1}, AxesLabel -> {"X", "Y", "Z"}, DisplayFunction -> Identity]

请自己找一本教材，系统地学习一下mathematica的基本命令。然后多看帮助文档，mathematica的帮助文档是我所见过的所有软件里做的最好的。 画二维图用plot命令 plot[sin[t],{t,0,2pi}] 画三维图用plot3d命令 plot3d[sin[x+y],{x,0,2pi},{y,0,2pi}] 记住，输入命令之后，按小键盘上的回车，执行命令。