求函數y=ex cosx的二階導數

y' = e^x cosx - e^x sinx
y'' = e^x cosx - e^x sinx -（e^x sinx + e^x cosx）
= -2e^x sinx

將下列句子合併為含有賓語從句的複合句.
1 It's going tosnow.Shethought.2 Are you a tescher？Please tell me.3 Where are you going？Can you tell me？4 He has seen thefilm.Hetold me.
5 Who will help Mary with English？He asked me.

1 It's going tosnow.Shethought.
She thought it was going to snow.
2 Are you a tescher？Please tell me.
Please tell me if / whether you are a teacher.
3 Where are you going？Can you tell me？
Can you tell me where you are going？
4 He has seen thefilm.Hetold me.
He told me he had seen the film.
5 Who will help Mary with English？He asked me.
He asked me who would help Mary English.

把下麵的句子合併為含有賓語從句的主從複合句
When does the train arrive please tell me.
please tell me____ _ _ _.
What does he do？do you know？
do you know __ _？
Do they want fried chicken he asked boys.
he asked boys _fried chicken .
Was the watch made in shanghai？I don't know.
I don't knowthe watch __ _in shanghai
He son will pass the exam .he said.
he saidhis son _ _the exam .

電鍋電毯，你好！
When does the train arrive？Please tell me.
Please tell me what time the train arrives.
What does he do？Do you know？
Do you know what he does？
Do they want fried chicken？He asked boys.
He asked boys whether\if they wanted fried chicken .
Was the watch made in shanghai？I don't know.
I don't know whether\if the watch was made in shanghai.
He son will pass the exam .He said.
he said that his son would psss the exam .
應該是對的，我們老師剛剛講了賓語從句.
規則是這樣的；
①連接詞
⑴that（可省略）接陳述句
⑵whether\if接一般疑問句
⑶疑問詞接特殊疑問句
②語序
主句+連接詞+從句主語+從句謂語+其它
③時態
1·主句用一般現在時時，從句應選擇適當的時態.
2·主句用一般過去時時，從句要用過去時態中的一種.
3·當從句是客觀真理、諺語、格言時，無論主句是何種時態，從句都使用一般現在時.
我們英語老師要求我們全都背下來，並說背下來就什麼題都扛得住，我們都照做了，果然如此！囙此，我也建議你一字不差的背下來，效果挺好的.
我打得這麼辛苦，意思意思吧！

將下列句子合併成帶有賓語從句的複合句.
1.Hesaid.Hedoesn't want to move to the city.
2.The girl asks. Is it necessary to learn computer？
3.Could you tell me？What are they talking about？
4.I want to know. When does Jim do his homework.
5.Do you think？They need to wear uniforms every day.
6.The teacher told us. Mother's Day is on the second Sunday of May.

1.Hesaid.Hedoesn't want to move to thecity.Hesaid that he didn't want to move to the city.2.The girlasks.Isit necessary to learn computer？The girl asks that is it necessary to learn computer？3.C…

將下列句子合併為含有賓語從句的複合句.
I believe .My uncle can speak English welll.
Did John go to the zoo yesterday？George asked.
When will the movie be on？Can you tell me？
The earth goes around thesun.Theteacher told us.

I believe .My uncle can speak English welll.【I believe that my uncle can speak English well.】Did John go to the zoo yesterday？George asked.【George asked that whether John went to the zoo yesterday….

將下列句子改為含賓語從句的複合句
How many birds are there in the tree Kate asked.

He asked me how many birds there were in the tree.

改成含有賓語從句的複合句
1、light travels faster thansound.myteacher told me
my teacher told me _light faster than sound
2、there will be a meeting in fivedays.jackdidn't know.
jack didn't know _there a meeting in five days.
3、can they speak French？i want to kown
i want to kown _ _ _ _French.
4、are the children playing games？Tell me.
Tell me _the children _ _games.
5、have you finished your homework yet？Mr.Zhaoasked Ma Gang.
Ma.Zhaoasked Ma Gang
Mr.Zhaoasked Ma Gang _ _ _ _homework yet.
6、how many people can you see in the picture？who knows？
who knows_ __ _ _in the picture？
7、where did she park her car？do you know？
do you know her car？
8、what does he often talk about？the girl wondered.
the girl wondered often _about.
9、who knocked at the door so loudly？i don't know.
i don't know _at the door so loudly.
10、does he still live in that street？i don't know.
i don't know he still ___in the street.
11、what's his name？i asked him.
i asked him what _ _ _.
12、when does the train arrive？please tell me.
please tell me _ _ _ _
13、do they want fried chicken？he asked the boys.
he asked the boys _they ____fried chicken.
14、was the watch made in Shanghai？i don't know.
i don't know _the watch _made in Shanghai.
1）we are sure that he _（go）th school tomorrow.
2）do you know who __（be）the first man to talk on the room？
3）could you tell me where the post office （is）？
4）our father said that he _（will）buy a new computer.
5）i hear that he____（swim）in the sea yesterday.

1、light travels faster than sound. my teacher told me1 my teacher told me that light travels faster than sound.2、there will be a meeting in five days. jack didn't know.2 jack didn't know that there…

將下列句子連接成含有賓語從句的複合句
These flowers are formGuandong.shesaid
Light travels faster thansound.myteacher told me
There will be a meeting in fivedays.Jackdidn't know
Can they speak French？I want to know
Are the children playing games？Tell me
Have you finished your homework yet？Mr.Zhaoasked Ma chao
How many people can you see in the picture？Who know？
Where di she park her car？Do you know？
What does he often talk about？The girl wondered
Who knocked at the door so loudly？I don't know
There are seven days in a week .zhe teacher said
儘快，急用，

She said these flowers are form Guandong.
My teacher told me Light travels faster than sound.客觀事實真理從句用一般現在時
Jack didn'；t know if there would be a meeting in five days.
I want to know ；if they can ；speak French.
Tell me if the children are playing games.
Mr.Zhaoasked Ma Chao if he has finished his homework.
Who knows how many people you can see in the picture？；這道題本身有點問題，翻譯過來彆扭
Do you know where she parked her car？
The girl wondered what he often talked about.
I don'；t know who knocked at the door so loudly.
The teacher said there are seven days in a week.客觀事實真理從句用一般現在時
；
這是第一個回答哦，主要因為這道題分類不正確，所以沒人回答
如果沒有問題，請點擊選為滿意回答按鈕

把兩個句子改為一個複合句
Jim told me . He likes to learn Chinese.

參考答案：Jim told me（that）he liked to learn Chinese.
說明：that用括弧括起來，表示這裡的that可用可不用，
因為，在賓語從句中，連接詞可以省略.

把一個英語句子改為複合句
Studying without relaxing isn't good for health改為複合句

It's not good for health when you study without relaxing.

求函數y=ex cosx的二階導數