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#b5eac8ee-3d90-40ca-9555-212c82923efe简单填空题等比数列的概念与通项数列

4. 设数列{an}\{a_{n}\}为等比数列,若a2+a3+a4=2a_{2}+a_{3}+a_{4}=2a3+a4+a5=4a_{3}+a_{4}+a_{5}=4,则数列{an}\{a_{n}\}的前6项和为((  ))