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给出如图的一个直角三角形数阵;满足每一列成等差数列,从第三行起,每一行的数成等比...
给出如图的一个直角三角形数阵;满足每一列成等差数列,从第三行起,每一行的数成等比数列,且每一行的公比相等,如果记第一行的数为a
1,第二行的第一个数为a
2,第二个数为a
3,第三行的第一个数为a
4,…,则a
83=( )
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A.
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B.
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C.2
D.1
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设P、Q为△ABC所在平面内的两点,且
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则△ABP的面积与△ABQ的面积之比为( )
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