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【简答题】
已知等比数列{a n }满足a 1 =1，0＜q＜ 1 2 ，且对任意正整数k，a k -（a k+1 +a k+2 ）仍是该数列中的某一项，则公比q的取值集合为______．
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【简答题】Read and choose the best answer. In the European Middle Ages breakfast was not usually thought to be necessary and important. In earlier periods, it didn't even exist. Only two formal meals were had b...
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