二项式(2
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)
6展开式中常数项是
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考点分析:
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已知函数
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若a,b,c互不相等,且f(a)=f(b)=f(c),则abc的取值范围是( )
A.(1,10)
B.(5,6)
C.(10,12)
D.(20,24)
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直线MN与双曲线C:
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=1(a>0,b>0)的左右支分别交于M、N点,与双曲线的右准线相交于P点,F为右焦点,若|FM|=2|FN|,又
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=λ
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(λ∈R),则实数λ的值为( )
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A.
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B.2
C.
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D.3
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在四棱锥P-ABCD中,底面是边长为1的菱形,∠ABC=60°,PA⊥底面ABCD,PA=1,则异面直线AB与PD所成角的余弦值为( )
A.
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B.
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C.
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D.
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已知随机变量X服从正态分布N(3,1),且P(2≤X≤4)=0.6826,则P(X>4)=( )
A.0.1588
B.0.1587
C.0.1586
D.0.1585
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