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设Sn为等差数列{an}的前n项和,若a1=1,公差d=2,Sk+2-Sk=24...
设Sn为等差数列{an}的前n项和,若a1=1,公差d=2,Sk+2-Sk=24,则k= .
考点分析:
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已知数列{a
n}满足:
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