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已知数列{an}的前n项和Sn满足:Sn+Sm=Sn+m(m,n∈N*)且a1=...
已知数列{an}的前n项和Sn满足:Sn+Sm=Sn+m(m,n∈N*)且a1=6,那么a10=( )
A.10
B.60
C.6
D.54
考点分析:
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如图,大正方形的面积是34,四个全等直角三角形围成一个正方形,直角三角形的较短边长为3,向大正方形内设一飞镖,则飞镖落在小正方形内的概率为( )
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=1的一个焦点与抛物线y
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C.
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-y
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D.
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