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- 1Yeah,it's wonderful!Thank you very much.
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- 4什么句型啊i'd rather play basketball than swim.
- 5It 's necessary that 主 (should) do是什么结构啊,有什么说法吗
- 662减56除7等于几
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- 8数列{an}中,a1=1/2,当n>=2时,Sn=n2an (n的平方*an),求通项an
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