题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061432-56359.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061432-80649.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061433-19676.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061433-46794.gif)
⑴当
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061433-19676.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061432-56359.gif)
⑵求
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061433-40667.gif)
⑶求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061433-30445.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061433-19676.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061434-49633.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061434-80737.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061432-56359.gif)
⑵-20
⑶
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061434-49633.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061434-66412.gif)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061434-30957.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061432-80649.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061433-46794.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061434-52804.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061435-59756.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061434-52804.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061435-19771.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061435-78286.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061434-52804.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061435-57364.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061436-77016.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061436-77881.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061436-99217.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061434-52804.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061434-80737.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061432-56359.gif)
⑵
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061434-30957.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061432-80649.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061434-52804.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061433-40667.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061436-99828.gif)
⑶由⑴得,当
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061435-57364.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061436-77016.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061436-77881.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061436-99217.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061434-52804.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061436-50766.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061437-31875.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061434-66412.gif)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061353-45707.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061353-97497.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061353-50543.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061354-74773.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061353-50543.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061354-72005.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061354-31177.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061354-50595.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061353-50543.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061354-85370.gif)
已知数列
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061354-72005.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061355-80808.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061354-72005.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061345-83722.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061346-59337.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061345-83722.gif)
⑵已知数列
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061345-83722.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061346-48511.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061345-83722.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061339-79584.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061339-14741.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061339-79584.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061332-11345.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061332-48102.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061332-61686.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061332-50823.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061332-38393.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061333-97518.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061333-88079.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061333-17351.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061333-87335.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061324-17214.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061324-30731.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061324-17214.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061325-84973.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061325-41761.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061325-53144.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061325-69240.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061325-54059.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061326-87978.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061326-69543.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061326-74326.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061326-99354.gif)
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