笛卡儿积区域
创建一个圆盘和线的笛卡儿积.
| In[1]:= |  X |
| In[2]:= |  X |
| Out[2]= |  |
用公式区域创建区域积.
| In[3]:= |  X |
| In[4]:= |  X |
| In[5]:= |  X |
| Out[5]= |  |
属性，例如：体积，可以像其他区域一样被计算.
| In[6]:= |  X |
| Out[6]= |  |
创建和计算任意维数的区域积.
| In[7]:= |  X |
| In[8]:= |  X |
| Out[8]= |  |
| In[9]:= |  X |
| Out[9]= |  |
| In[10]:= |  X |
| Out[10]= |  |
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