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       A.1                        B.6ec8aac122bd4f6e                      C.6ec8aac122bd4f6e                      D.6ec8aac122bd4f6e

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16.三个半径为1的球互相外切,且每个球都同时与另外两个半径为r的球外切。如果这两个半径为r的球也互相外切,则r的值为                                                                                  (    )

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    现有四个命题:①6ec8aac122bd4f6e,②6ec8aac122bd4f6e,③2008!!个位数为0,④2009!!个位数为5。其中正确的个数为                                       (    )

       A.1                        B.2                        C.3                        D.4

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    6ec8aac122bd4f6e

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15.对任意正整数n,定义n的双阶乘n!!如下:当n为偶数时,

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14.已知非零向量6ec8aac122bd4f6e则△ABC的形状是                                                     (    )

       A.三边均不相等的三角形                      B.直角三角形

       C.等腰(非等边)三角形                      D.等边三角形

 

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       A.6ec8aac122bd4f6e              B.6ec8aac122bd4f6e              C.6ec8aac122bd4f6e               D.6ec8aac122bd4f6e

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13.无穷等比数列6ec8aac122bd4f6e…各项的和等于                                                   (    )

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    6ec8aac122bd4f6e的作用下变换成曲线6ec8aac122bd4f6e的值为         

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12.矩阵的一种运算6ec8aac122bd4f6e该运算的几何意义为平面上的点6ec8aac122bd4f6e在矩阵6ec8aac122bd4f6e的作用下变换成点6ec8aac122bd4f6e在矩阵

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