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若二项式的展开式中,第4项与第7项的二项式系数相等,则展开式中x6的系数为 .(...
若二项式
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的展开式中,第4项与第7项的二项式系数相等,则展开式中x
6的系数为
.(用数字作答)
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在(0,+∞)有两个不同的解α,β(α<β),则下面结论正确的是( )
A.
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B.
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C.
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D.
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如图,阅读程序框图,任意输入一次x(0≤x≤1)与y(0≤y≤1),则能输出数对(x,y)的概率为( )
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A.
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B.
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C.
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D.
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已知等差数列{a
n}满足,a
1>0,5a
8=8a
13,则前n项和S
n取最大值时,n的值为( )
A.20
B.21
C.22
D.23
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一简单组合体的三视图及尺寸如图(1)示(单位:cm)则该组合体的体积为.( )
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A.72000cm
3B.64000cm
3C.56000cm
3D.44000cm
3
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