12.已知等比數(shù)列的前項(xiàng)和為,且是與的等差中項(xiàng),則數(shù)列的公比為 查看更多

 

題目列表(包括答案和解析)

已知等比數(shù)列的前項(xiàng)和為,且與2的等差中項(xiàng),等差數(shù)列中,,點(diǎn)在直線上.

⑴求的值;

⑵求數(shù)列的通項(xiàng);

⑶ 設(shè),求數(shù)列的前n項(xiàng)和

 

查看答案和解析>>

(14分)已知等比數(shù)列的前項(xiàng)和為,且與2的等差中項(xiàng),

等差數(shù)列中,,點(diǎn)在直線上.

⑴求的值;

⑵求數(shù)列的通項(xiàng);

⑶ 設(shè),求數(shù)列的前n項(xiàng)和

 

查看答案和解析>>

已知等比數(shù)列的前項(xiàng)和為,且與2的等差中項(xiàng),等差數(shù)列中,,點(diǎn)在直線上.
⑴求的值;
⑵求數(shù)列的通項(xiàng);
⑶ 設(shè),求數(shù)列的前n項(xiàng)和

查看答案和解析>>

已知等比數(shù)列的前項(xiàng)和為,且與2的等差中項(xiàng),等差數(shù)列中,,點(diǎn)在直線上.
⑴求的值;
⑵求數(shù)列的通項(xiàng);
⑶ 設(shè),求數(shù)列的前n項(xiàng)和

查看答案和解析>>

已知等比數(shù)列的前項(xiàng)和為,且與2的等差中項(xiàng),等差數(shù)列中,,點(diǎn)在直線上.
⑴求的值;
⑵求數(shù)列的通項(xiàng);
⑶ 設(shè),求數(shù)列的前n項(xiàng)和

查看答案和解析>>


同步練習(xí)冊(cè)答案