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学霸在哪里啊求帮助

      发布时间:2019-07-07 11:09

      81, carry

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      ACD,注意昼夜长短就好了

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      four years', and I have also been taught different lessons by lots of different patient teachers.
      I have grown up a lot in the past four years; school life plays an important role in my life.
      I enjoy making friends, getting knowledge and having interesting time in my school. I have also made friendship with lots of classmates. I will never forget my four years' school lifeI've been in my middle school for four years

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      “ 语义”不深,

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      原文】江南好,风景旧曾谙。日出江花红胜火,春来江水绿如蓝。能不忆江南? 【翻译】江南的风景多么美好,如画的风景久已熟悉。太阳从江面升起时江边的鲜花比火红,春天到来时碧绿的江水象湛蓝的蓝草。怎能叫人不怀念江南? 【原文】江南忆,最...

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      During this National Day holidays, free passage was given to cars on the highway for the first time ever, which caused a heated discussion nationwide. On the bright side, some believe that it is good to stimulate consumption an...

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      81, carry

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      第二题选a

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      I've been in my middle school for four years. four years' school life plays an important role in my life. I enjoy making friends, getting knowledge and having interesting time in my school. I have also made friendship with lots...

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      我是张晓鸽

      回复:

      ACD,注意昼夜长短就好了

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      解:(1)。a₁=S₁=2-32=-30;当n≧2时,a‹n›=S‹n›-S‹n-1›=(2n²-32n)-[2(n-1)²-32(n-1)]=4n-34; n=1时a₁=4-34=-30,故对n=1也可以。即通项a‹n›=4n-32(n=1,2,3,......

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