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用1,2,3,4,5,6组成六位数(没有重复数字),要求任何相邻两个数字的奇偶性...
用1,2,3,4,5,6组成六位数(没有重复数字),要求任何相邻两个数字的奇偶性不同,且1和2相邻.这样的六位数的个数是 (用数字作答).
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已知
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023212138863801513/SYS201310232121388638015015_ST/0.png)
是平面内的单位向量,若向量
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满足
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•(
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-
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)=0,则|
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|的取值范围是
.
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如图,已知球O的面上四点A、B、C、D,DA⊥平面ABC,AB⊥BC,DA=AB=BC=
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,则球O的体积等于
.
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在△ABC中,角A、B、C所对的边分别为a、b、C、若(
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b-c)cosA=acosC,则cosA=
.
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已知F
1、F
2为椭圆
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023212138863801513/SYS201310232121388638015012_ST/0.png)
+
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=1的两个焦点,过F
1的直线交椭圆于A、B两点.若|F
2A|+|F
2B|=12,则|AB|=
.
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