求 n 维公式
导出 
维单位实心球（Ball） 的区域测度公式.
| In[1]:= |  X |
| Out[1]= |  |
| In[2]:= |  X |
| Out[2]= |  |
导出 
维单位单形的区域测度公式.
| In[3]:= |  X |
| Out[3]= |  |
| In[4]:= |  X |
| Out[4]= |  |
导出 
维单位球面的区域测度公式.
| In[5]:= |  X |
| Out[5]= |  |
| In[6]:= |  X |
| Out[6]= |  |
导出 
维单位实心球的对 
积分的公式.
| In[7]:= |  X |
| Out[7]= |  |
| In[8]:= |  X |
| Out[8]= |  |
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