Which of the following phrases in the fifth paragraph indicates the fridge's negative effect on the environment?
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举一反三
【简答题】已知数列{a n }是一个公差大于0的等差数列,且满足a 3 a 6 =55,a 2 +a 7 =16 (1)求数列{a n }的通项公式; (2)数列{a n }和数列{b n }满足等式a n = b 1 2 + b 2 2 2 + b 3 2 3 +…+ b n 2 n (n∈N * ),求数列{b n }的前n项和S n .