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(本小题满分12分) 已知等差数列 前三项的和为 ,前三项的积为 . (Ⅰ)求等差数列 的通项公式; (Ⅱ)若 , , 成等比数列,求数列 的前
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参考答案:
举一反三
【单选题】微信公众号排版遵循设计中四个原则,以下哪个选项符合?
A.
醒目、对齐、对比、重复
B.
对齐、对比、重复、统一
C.
对比、突出、重复、统一
D.
美观、对称、简洁、统一
【单选题】Reading in Depth Fill in the blanks in the following passage by selecting suitable words from the Word Bank given below. Each choice in the Word Bank is identified by a letter. You may not use any of ...
A.
complain
B.
adjust
C.
adapt
D.
range
E.
negative
F.
positive
G.
mature
H.
hostility
I.
morality
J.
ease K. frustrations L. depressed M. neglected N. temporary O. contemporary
【判断题】利用电阻式传感器可以测量位移、力、应变、荷重、压力、扭矩、温度、湿度、气体成分及浓度等物理量。
A.
正确
B.
错误
【单选题】急性咽炎时,咽部检查可见的体征是
A.
咽部粘膜充血、水肿
B.
表面粗糙
C.
淋巴滤泡增生
D.
扁桃体肿大
E.
声音嘶哑
【简答题】急性咽炎时,咽部检查可见的体征是
【简答题】Relationships can be difficult, everything cannot always run smoothly along. No matter how much we may want it, life does not go as planned. Happily ever after is not 1. ________guaranteed. 2. ______t...
【简答题】(NEW YORK)---Scientists have discovered small signs of awareness in some vegetative(植物人的) brain injury patients and have even communicated with one of them---findings that are beneficial to how to ass...
【单选题】干燥得以进行的必要条件是
A.
物料内部温度必须大于物料表面温度
B.
物料内部水蒸气压力必须大于物料表面水蒸气压力
C.
物料表面水蒸气压力必须大于空气中的水蒸气压力
D.
物料表面温度必须大于空气温度
【简答题】Euro hovers near 23-month lows as dollar bulls eye U.S. GDP data April 26, 2019 LONDON, April 26 (Reuters) - The euro hovered near its weakest level since May 2017 on Friday as traders waited to see w...
【单选题】高聚物通过定向聚合之后,使用温度大大( )。
A.
提高
B.
下降
C.
不变
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