配套习题-等比数列的常见判定方法 -【青果学院】

本课配套习题挑战模式1/3

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单选题

难度系数：

1.已知等比数列{a_n}，则下列一定是等比数列的是（　　）

A: {a_n+a_n+1}

B:

C: {a_n+2}

D: {|a_n|}

提示1：IOWIqeeUqOetieavlOaVsOWIl+eahOWumuS5iQ==
答案：RA==
6Kej77ya6Kej77ya4oi1PGltZyB3aWR0aD01NiBoZWlnaHQ9NDYgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC9GRS83OC9yQkFDRTFOUXVtZVM4MEx4QUFBQ1dCNDBsemc1MjIucG5nIj7kuLrluLjmlbDvvIw8YnI+4oi0PGltZyB3aWR0aD02NiBoZWlnaHQ9NTAgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC9GRS83OC9yQkFDRTFOUXVtZUFLN0xKQUFBQ2xyT0c0clU4ODQucG5nIj7kuZ/kuLrluLjmlbDvvIw8YnI+4oi05pWw5YiXe3xhPHN1Yj5uPC9zdWI+fH3kuIDlrprmmK/nrYnmr5TmlbDliJcuIDxicj7mlYXpgIlELiA=

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单选题

难度系数：

2.已知数列{a_n}满足：a₁=2，a_n+1=2a_n+1，则数列{a_n+1}为（）

A: 等差数列

B: 等比数列

C: 常数列

D: 无法判断

提示1：5Yip55So5pWw5YiX6YCS5o6o5byP77yM57uT5ZCI562J5q+U5pWw5YiX55qE5a6a5LmJ77yM5Y2z5Y+v5b6X5Yiw57uT6K66Lg==
答案：Qg==
6Kej77ya6K+B5piO77ya4oi1YTxzdWI+bisxPC9zdWI+PTJhPHN1Yj5uPC9zdWI+KzHvvIw8YnI+4oi0PGltZyB3aWR0aD0xNDEgaGVpZ2h0PTQ2IHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvRkUvNzgvckJBQ0UxTlF1bF9qUUJVWUFBQURZQWczZ2Y0MjI3LnBuZyI+77yMPGJyPuKItWE8c3ViPjE8L3N1Yj49Mu+8jDxicj7iiLTmlbDliJd7YTxzdWI+bjwvc3ViPisxfeaYr+S7pTPkuLrpppbpobnvvIzku6Uy5Li65YWs5q+U55qE562J5q+U5pWw5YiXLiA=

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单选题

难度系数：

3.已知{a_n}，{b_n}都是等比数列，那么（　　）

A: {a_n+b_n}，{a_n•b_n}都一定是等比数列

B: {a_n+b_n}一定是等比数列，但{a_n•b_n}不一定是等比数列

C: {a_n+b_n}不一定是等比数列，但{a_n•b_n}一定是等比数列

D: {a_n+b_n}，{a_n•b_n}都不一定是等比数列

提示1：IOW9k+S4pOS4quaVsOWIl+mDveaYr+etieavlOaVsOWIl+aXtu+8jOi/meS4pOS4quaVsOWIl+eahOWSjOS4jeS4gOWumuaYr+etieavlOaVsOWIl++8jOavlOWmguWPluS4pOS4quaVsOWIl+aYr+S4pOiAheS6kuS4uuebuOWPjeaVsOeahOaVsOWIl++8jOmimOebrueahOWSjOWwseS4jeaYr+etieavlOaVsOWIl++8jOS4pOS4quetieavlOaVsOWIl+eahOenr+S4gOWumuaYr+etieavlOaVsOWIly4=
答案：Qw==
6Kej77ya5b2T5Lik5Liq5pWw5YiX6YO95piv562J5q+U5pWw5YiX5pe277yMPGJyPui/meS4pOS4quaVsOWIl+eahOWSjOS4jeS4gOWumuaYr+etieavlOaVsOWIl++8jOavlOWmguWPluS4pOS4quaVsOWIl+aYr+S4pOiAheS6kuS4uuebuOWPjeaVsOeahOaVsOWIl++8jOmimOebrueahOWSjOWwseS4jeaYr+etieavlOaVsOWIl++8jDxicj7kuKTkuKrnrYnmr5TmlbDliJfnmoTnp6/kuIDlrprmmK/nrYnmr5TmlbDliJfvvIw8YnI+5pWF6YCJQy4g