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若(ax-1)5的展开式中x3的系数是80,则实数a的值是 .
若(ax-1)5的展开式中x3的系数是80,则实数a的值是 .
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3.
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已知F
1(-c,0),F
2(c,0)为椭圆
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的两个焦点,P为椭圆上一点且
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,则此椭圆离心率的取值范围是( )
A.
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B.
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C.
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D.
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已知三角形ABC中,点D是BC的中点,过点D的直线分别交直线AB,AC于E、F两点,若
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=
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(λ>0),
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=μ
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(μ>0),则
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的最小值是( )
A..9
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C.5
D.
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设等差数列{a
n} 的前n项和为S
n,a
2、a
4是方程x
2-2x+b=0的两个根,则S
5等于( )
A.5
B.-5
C.
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D.-
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执行如图所示的程序框图,则输出的S的值是( )
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A.-1
B.
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C.
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D.4
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