一個幾何級數(shù)中,第一項比第二項大32,第二項與第三項的和是48,求這個級數(shù)的無窮和.
設(shè)幾何級數(shù)的前三項是a,aq,aq^2,則
a-aq=32,aq+aq^2=48,解得
a=8,q=-3,這時無窮和發(fā)散,
a=64,q=1/2,這時a+aq+aq^2+...=64/(1-1/2)=128.
in a certain geometric sequence the first term exceeds the second term by 32 and the sum of the second and third is 48,f
in a certain geometric sequence the first term exceeds the second term by 32 and the sum of the second and third is 48,find the infinite sum of rhe sequence
數(shù)學(xué)人氣：846 ℃時間：2020-05-12 13:05:10
優(yōu)質(zhì)解答
我來回答
類似推薦
- 簡單數(shù)學(xué)題（英文）
- 簡單的數(shù)學(xué)題（不過是英文的）
- 英語翻譯
- John and Jay run the 220-yard dash ,and Jay wins the race by 10 yards .if Jay runs the race in 30 seconds ,what is the r
- Two angles that add up to 90 degrees are called__________angles.
- 梁啟超提出的"輿論之母"是指什么?
- 冒高氯酸煙
- 【急!今天10點(diǎn)就要!】一道仿照例句 寫句子的題.
- 6分之5×58＋8分之1×41＋8分之1
- 在三角形ABC中,已知a=2,b=3,c=120°,則sinA的值為 求詳解,急
- 讀《論語》有感
- 1111分之111與11111分之1111那個大?
猜你喜歡
- 1都有哪些東西可以和速度快或是加快速度有聯(lián)系的（物品,事件,詞語,現(xiàn)象等）希望盡量全面些哦!
- 2英語動詞填空what he said _______(record) just now. We can listen to it again.
- 3服裝廠生產(chǎn)襯衫,上半月完成計劃的45%,下半月比上半月多生產(chǎn)350件,剛好完成任務(wù).
- 4Tim was very______because many friends came to his birthday party.
- 5we moved to Canada in 2008變成否定句
- 6澄清石灰水中加鹽酸的離子方程式是?
- 7I think that it's a useful to learn a foreign-language.
- 8世界上有多少種字典?有多少種查字典的方法?應(yīng)該怎樣查?
- 9如果A>0,B>0,那么A+B>0 的逆命題,是真是假
- 10一個多邊形除了一個內(nèi)角外，其余各內(nèi)角之和為1680°，那么這個多邊形的邊數(shù)為_．
- 11鋁與硫酸鐵反應(yīng)
- 12把下列句子整理成一段通頗的話,在括號里填上序號.快的加50分~