mình đg cần rất gấp mong ai giúp với
K
Khách
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
Những câu hỏi liên quan
PM
3
30 tháng 8 2021
PTHH: 2Al + 6HCl → 2AlCl3 + 3H2
PTHH: Mg(OH)2 + 2HCl → MgCl2 + 2H2O
PTHH: Fe2O3 + 6HCl → 2FeCl3 + 3H2O
PTHH: K2O + 2HCl → 2KCl + H2O
30 tháng 8 2021
Lần sau em đăng câu hỏi đúng box để mọi người hỗ trợ nha
PM
1
DT
Đỗ Thanh Hải
CTVVIP
14 tháng 9 2021
1 knowing the answer, they told us
2 the unique handicraft, we didn't like it
3 We looked into these machines so that we could find out the method
We looked into these machines so as to find out the method
4 Jack's poverty, everyone looks up to him
5 In order to choose the best chair, Linda looked through this catalouge
6 is not as dirty as this one
7 I didn't play as successfully as Linda
8 A dog can't run as fast as a horse
A dog runs more slowly than a horse
9 No rivers in the world is as long as the Nile
10 No one in my family talks as politely as Linda
PM
0
PM
1
DT
Đỗ Thanh Hải
CTVVIP
12 tháng 9 2021
1 was arrested before the garden by the boy yesterday
2 his cats taken care of carefully by Jack everyday
3 Has the country been protected from Covid-19 successfully
4 is reported that the man is running out of money
is reported to be running out of money\
5 has been said that the thief got out of the prison
has been said to have got out of the prison
6 was thought that Mary had turned down the job
Mary was thought to have turned down the job
PM
1
13 tháng 9 2021
\(1,\\ a,=\dfrac{\left(3+2\sqrt{3}\right)\sqrt{3}}{3}+\dfrac{\left(2+\sqrt{2}\right)\left(\sqrt{2}-1\right)}{1}\\ =\dfrac{3\sqrt{3}+6}{3}+\sqrt{2}=\sqrt{3}+1+\sqrt{2}\\ b,=\left(\dfrac{\sqrt{5}+\sqrt{2}}{3}-\dfrac{\sqrt{5}-\sqrt{2}}{3}+1\right)\cdot\dfrac{1}{\left(\sqrt{2}+1\right)^2}\\ =\dfrac{\sqrt{5}+\sqrt{2}-\sqrt{5}+\sqrt{2}+3}{3}\cdot\dfrac{1}{\left(\sqrt{2}+1\right)^2}\\ =\dfrac{2\sqrt{2}+3}{3\left(3+2\sqrt{2}\right)}=\dfrac{1}{3}\)
\(2,\\ A=2x+\sqrt{\left(x-3\right)^2}=2x+\left|x-3\right|\\ =2\left(-5\right)+\left|-5-3\right|=-10+8=-2\\ B=\dfrac{\sqrt{\left(2x+1\right)^2}}{\left(x-4\right)\left(x+4\right)}\left(x-4\right)^2=\dfrac{\left|2x+1\right|\left(x-4\right)}{x+4}\\ B=\dfrac{17\cdot4}{12}=\dfrac{17}{3}\)
PM
1
DT
Đỗ Thanh Hải
CTVVIP
5 tháng 9 2021
1 hadn't seen - were
2 doesn't like - being phoned
3 is eaten
4 is leaving - will wait
5 won't be - will you go
6 is coming - don't want
7 hasn't read - have gone
8 haven't seen - left
9 was washing - was writing
10 sets - goes
11 were talking - walked
12 has stayed - studied - was
13 was made
14 had told - went away
15 will be held
16 had gone - sat - rested
17 watched - had done
PM
1
DT
Đỗ Thanh Hải
CTVVIP
5 tháng 9 2021
1 is grown in many countries in the world
2 was invented by Graham bell many years ago
3 has been used for many years
4 Is English practiced by Lan everyday
5 will be taken out of the city
6 can this letter be sent by Mary 2 days ago
7 is being made from vegetables
8 must be finished before Sunday
9 hadn't been used for a long time
10 Will I be met at the airport by Jack tomorrow
12 It is thought that Maradona is.....
13 It has been believed that the job is.....
14 It was explained that this powerful.....
