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【简答题】
已知等差数列{a n }，d≠0，a 5 =8，且项a 5 ，a 7 ，a 10 分别是某一等比数列{b n }中的第1，3，5项，（1）求数列{a n }的第12项 （2）求数列{b n }的第7项．
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