y=1/（2-x-x^2）的n階導數線上等.

y=1/（2-x-x^2）的n階導數線上等.

y=1/（2-x-x^2）
=1/3 * [1/（2-x）+1/（1+x）]
而
1/（2-x）的n階導數為n！/（2-x）^（n+1）
1/（x+1）的n階導數為n！*（-1）^n /（x+1）^（n+1）
所以得到y的n階導數
y（n）=1/3 *n！*[1/（2-x）^（n+1）+（-1）^n/（x+1）^（n+1）]

f（x）=1-x/ax的導數
如題，要過程，和代入哪條公式

商的導數的運算法則：（u/v）'=（u'v-uv'）/v^2
f（x）=1-x/ax
f'（x）=[（1-x）'×（ax）-（1-x）×（ax）']/（ax）^2
=[-1×（ax）-（1-x）×a]/（ax）^2
=-a/（ax）^2
很高興為您解答
如果本題有什麼不明白歡迎追問

f（x）=（1+x）/（1-x）e^（-ax）的導數怎麼求？
寫的詳細點~

f（x）=（1+x）/（1-x）e^（-ax）
f'（x）='
打字方便起見設=x1
=x2
=（x1）'（x2）+（x1）（x2）'…（1）
'=2/（1-x）^2…（2）
'=ae^ax.（3）
再帶到（2），（3）帶到（1）中即可求解

初一英語同義詞
1、Tim usually（spends）two hours doing his homework.
把括弧裏的詞語換成用cost的同義詞
2、I can help you to learn Chinese.（help…with）

Tim’s homework usually costs him two hours.
I can help you with Chinese.
希望能夠幫到樓主

改為同義詞
We have black and white hats for $15（改為同義詞）
We have black and white hats _____the _____＿＿＿＄15

很高興能够在這裡回答你的問題，
應該填寫：
We have black and white hats（at）the（price of）＄15

用英語解釋句子.
1.I usually take the undreground to school.
____________________________________
2.The tiger made the little animals die in the forest .
____________________________________
3.Our teacher asked Charles to reply to his question in ten minutes
____________________________________
4.Mr Lee got to the airport at 3.15 p.m
____________________________________
5.The soldier swam in the direction of the boy and helped him out of water.
____________________________________
用英語解釋句子。
英語！aaaaaaaaaaaaaaaa
就是同義句

樓主是說paraphrase嗎？
1 i usually go to school by the underground
我經常乘地鐵上學
2 the tiger is so strong that all little animals are driven to death.
森林裏老虎稱霸，使得小動物都死去了.
3 our teacher ask charles to answer within ten minutes.
老師讓查理在十分鐘內給出解答.
4 [這個句子的表達好像不對，應該沒有to]
mr lee arrived at the airport at 3:15pm
李先生是下午3:15到達機場的
5 the soldier swam to the boy and saved him out
這個戰士遊向小男孩的方向，並且把他救了出來.

用英語解釋句子
1.Everyone was cheerful at once._______________2.Are you stone deaf？______________3.Can you give me some suggestions？_____________4.I don’t feel like eating now._______________5.He was late because it rained heavily._______________6.The children _enjoyed_themselves_last night.________________7.Lucy is _as_old_as_Lily.________________8.The shop provides free paper for the customers._________________9.Why not go with me？___________10.There are more than 2000 students in my school.____________________

1、Everyone was happy
2、Do you hear nothing
3、can you advise me？
4、I have lost my appetite.
6、The children had a good time last night.
7、Lucy and Lily are the same age.
8、Customers took paper without paying

英語轉換同義詞
They pick up languages so naturally and esily.
pick up可以換成什麼同義詞？learn可以嗎？或有什麼更準確地？謝謝

learn可以，也可以用master

線上英語同義詞轉換
1.What color do you like best？___ ___ ___color？
2.Can I help you？What ___ ___ ___ ___you？
3.Tom is birthday is January 13th.Tomis___ ___ ___is January.
4.How old is Sam？__ ___ ____of Sam？
5.Do you want to see a movie？Do you want to ___ ___ ___？
最後一個打錯了，是四個孔。

what's your favourite
can I do for
date of birthday
what's the age
go to the cinema

英語：同義詞轉換.
Tom is too lazy to learn English well.
Tom is _____lazy _____ _____ _____learn English well.

too…to…常與so that…互換，注意：too…to+動詞原形.；so that+從句
答案：so；that he can't