giúp gấp với ạ 
K
Khách
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Những câu hỏi liên quan
DA
1
NT
3
NU
1
12 tháng 3 2023
mở bài là giới thiệu về cụ nha mn em viết lộn ạ
thân bài là đóng góp ạ
4N
1
giúp em với ạ mn mong mn giúp e\ạ em cần gấp ạ
ND
Nguyễn Đức Trí
VIP
6 tháng 9 2023
1.she spends 20 minutes to draw a picture
2.Lan is the most creative in the group
3.No one is smaller than him
4.My pen isn't the same than mine
5.Lan is jealous than her
6.My brother no longer raise pets
-chúc bạn thật thông minh!!!!
83
2
S
16 tháng 1 2022
PTHH : 2Al + 6HCl --> 2AlCl3 + 3H2 ↑ (1)
nAlCl3 = \(\dfrac{m}{M}=\dfrac{13,35}{27+35,5.3}=0.1\left(mol\right)\)
Từ (1) => nHCl = 2nH2 = 0.2 (mol)
=> mHCl = n.M = 0.2 x 36.5 = 7.3 (g)
16 tháng 1 2022
\(PTHH:2Al+6HCl\rightarrow2AlCl_3+3H_2\\ n_{AlCl_3}=\dfrac{m}{M}=\dfrac{13,35}{133,5}=0,1\left(mol\right)\\ Theo.PTHH:n_{HCl}=3.n_{AlCl_3}=3.0,1=0,3\left(mol\right)\\ m_{HCl}=n.M=0,3.36,5=10,95\left(g\right)\)
LK
giúp em với ạ em đang cần gấp ạ. Bài nào làm đc trc thì làm trc giúp em với ạ
1
28 tháng 10 2023
6:
\(2^{225}=\left(2^3\right)^{75}=8^{75}\)
\(3^{150}=\left(3^2\right)^{75}=9^{75}\)
mà 8<9
nên \(2^{225}< 3^{150}\)
4: \(\left|5x+3\right|>=0\forall x\)
=>\(-\left|5x+3\right|< =0\forall x\)
=>\(-\left|5x+3\right|+5< =5\forall x\)
Dấu = xảy ra khi 5x+3=0
=>x=-3/5
1:
\(\left(2x+1\right)^4>=0\)
=>\(\left(2x+1\right)^4+2>=2\)
=>\(M=\dfrac{3}{\left(2x+1\right)^4+2}< =\dfrac{3}{2}\)
Dấu = xảy ra khi 2x+1=0
=>x=-1/2
ND
1
H
5 tháng 1 2022
bạn đăng tách ra tầm 10 câu mỗi lần đăng nha, chứ dài ntnay ngại làm lắm~
5 tháng 1 2022
e có tách 3 bài ra rồi ạ, phiền anh/chị/bạn giúp e với ạ, e cảm ơn ạ
từ câu 16_>19 với từ 34-> 40
10. The first prize was awarded to the reporter by the board.
11. The Christmas cards have been sent to your family recently.
12. Ann was given some bananas and some flowers.
13. Coffee is grown in more than 50 countries around the world.
14. These books have been bought for 2 months.
15. Her dogs are fed twice a day.
16. Photo was taken for me by my dad yesterday.
17. The letter will be sent to his mother tomorrow.
18. This flower is watered by my father every morning.
19. Fiona was invited to his birthday by John last night.
20. The dinner is being prepared in the kitchen by her mother.
21. Our teeth should be cleaned twice a day.
22. The English grammar has been explained by our teachers.
23. The accident in this city was caused by some drunk drivers.
24. Tom's parents will be visited by him next month.
25. The secretary wasn't phoned by the manager this morning.
26. This beautiful dress is going to be bought by Mary.
27. These old pictures won't be hung in the living room.
28. This factory wasn't built by the German during the Second World War.
29. This house and these cars are going to be painted for Christmas Day by the Greens.
30. The cats have been fed by Ann since 7 a.m in the morning.
31. The pollution problems have been discussed by the students since last week.
32. The most valuable painting in the national musem has been stolen by the thieves.
33. The new president will be interviewed on TV.
34. 5 languages can be spoken by them.