giúp e vs ạ cảm ơn các a cj nhìu
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HP
29 tháng 7 2021
a, \(f\left(x\right)=2x^4-x^3+4x^2-x\)
\(\Rightarrow f'\left(x\right)=\left(2x^4-x^3+4x^2-x\right)'\)
\(=\left(2x^4\right)'-\left(x^3\right)'+\left(4x^2\right)'-\left(x\right)'\)
\(=2.4x^3-3x^2+4.2x-1\)
\(=8x^3-3x^2+8x-1\)
b, \(f\left(x\right)=2sinx\)
\(\Rightarrow f'\left(x\right)=\left(2sinx\right)'=2cosx\)
c, \(f\left(x\right)=\dfrac{3x^2+2x-5}{x}\)
\(\Rightarrow f'\left(x\right)=\left(\dfrac{3x^2+2x-5}{x}\right)'\)
\(=\left(3x+2-\dfrac{5}{x}\right)'\)
\(=\left(3x\right)'+\left(2\right)'-\left(\dfrac{5}{x}\right)'\)
\(=3+0+\dfrac{5}{x^2}=\dfrac{5}{x^2}+3\)
Mn giúp e bài này vs ạ , e cảm ơn nhìu ạ!
3 tháng 3 2022
1. many -> much
2. a apple -> an apple
3. Theirs -> Their
4. ???
5. visiting -> to visit
6. were -> was
em ko biết hả
30 tháng 5 2021
Mọi người giúp mình với mình đang cần gấp mình cảm ơn nhiều ạ
10 tháng 2 2022
Xet tam giac BDC va tam giac CEB ta co
^BDC = ^CEB = 900
BC _ chung
^BCD = ^CBE ( gt )
=> tam giac BDC = tam giac CEB ( ch - gn )
=> ^DBC = ^ECB ( 2 goc tuong ung )
Ta co ^B - ^DBC = ^ABD
^C - ^ECB = ^ACE
=> ^ABD = ^ACE
Xet tam giac IBE va tam giac ICD
^ABD = ^ACE ( cmt )
^BIE = ^CID ( doi dinh )
^BEI = ^IDC = 900
Vay tam giac IBE = tam giac ICD (g.g.g)
c, Do BD vuong AC => BD la duong cao
CE vuong BA => CE la duong cao
ma BD giao CE = I => I la truc tam
=> AI la duong cao thu 3
=> AI vuong BC
HZ
5
GH
2 tháng 4 2021
1. loves a birthday cake which I made for her very much.
2. suddenly colapsed when i was sitting on it .
3. The woman who is my president is Mr.Hung's wife.
4. Even though she is good at English ,they didn't accept her.
5. The novel which my uncle wrote 2 years ago is very intersting.
6. Have you ever spoken to the Browns who live next door ?
7. Where is the girl who sells the tickets ?
8. Though he had a serious financial problem , he didn't ask any friend of him for help.
9. Is MR.Pike ,who is from Australia, your teacher?
10. The book which will interesst children of all ages has just been published.
[Mik nghĩ chỗ the book này là nên chia bị động chứ nó không thể tự publish (xuất bản) được ]
GH
2 tháng 4 2021
11. David has a Master's degree , he works as a store clerk.
12. There are some word which are vẻy difficult to translate.
13. That is the most beutiful woman (whom) I have ever met.
14. All the things which we bought this morning are for the birthday party.
15. This is the most difficult question (which) I have ever met.
16. I met many people , their cattle and vehicles that went to the fair. ( vừa có người vừa có vật thì dùng ĐTQH là that )
17. They gave me four cakes , one of which was spoiled.
18. Intel computers ,which are made in Indian, are very good.
19. The building which was destroyed in the earthquake has now been rebuilt.
20. Although Mr John is over 80 years , he walks 10km everyday.
câu 1
a, Na2CO3
b, Al(OH)3
2. Từ CTHH Na2CO3 ta biết:
+ Na2CO3 được tạo ra từ 3 ng tố: Na , C ,O
+ Trong đó có 2 ng tử Na, 1 ng tử C , 3 ng tử O
+ PTKNa2CO3=23.2+12+16.3=124PTKNa2CO3=23.2+12+16.3=124
Từ CTHH Al(OH)3 ta biết:
+ Al(OH)3 tạo ra từ 3 ng tố: Al, O,H
+ Trong đó có 1 ng tử Al, 3 ng tử O, 3 ng tử H
+ PTKAl(OH)3=27+(16+1).3=78