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已知Sn是等差数列{an}的前n项和,且S11=35+S6,则S17的值为( )...
已知Sn是等差数列{an}的前n项和,且S11=35+S6,则S17的值为( )
A.117
B.118
C.120
D.119
考点分析:
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B.必要不充分条件
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已知向量
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+n
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与
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若A={2,3,4},B={x|x=n•m,m,n∈A,m≠n},则集合B的元素个数为( )
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已知数列{a
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