ai giúp mik với ạ :<
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DT
1
17 tháng 12 2021
c: \(=\dfrac{-27\cdot100}{-30}=\dfrac{2700}{30}=90\)
BD
1
1 tháng 8 2021
9 will have to
10 must work
11 will you do - fail
12 will you do
13 were - would buy
14 were - would help
15 had - would travel
16 had - would go
17 would tell - were
18 knew - would speak
19 gets - will go
20 can play - is
21 isn't raining - will have
22 had - would finish
23 wouldn't do - were
24 didn't speak
25 would buy - had
26 weren't - would buy
27 goes
28 will she go
29 would you do - were
30 were - would help
31 would you buy - were
32 would she do - were
33 will they do - become
34 would Ba go - had
35 had been - would have helped
36 had had - would have bought
37 hadn't bought - would have bought
38 would have been - hadn't rained
39 wouldn't have done
40 would have bought
41 would you do
42 would you have done
43 would you have done
44 would you have bought
45 has
46 would have come
III.
1 I will visit you
2 I would travel around the world
3 we will fail the final term test
4 you should take care of her
5 I would run away
6 we will go on a picnic
7 I would have got a good mark
8 he wouldn't be so fat now
9 I would kill it
DT
Đỗ Thanh Hải
CTVVIP
14 tháng 7 2021
1 bỏ ago
2 bỏ to - bỏ ago
3 read this novel for a week
4 written this book since last week
5 played badminton since 1986
6 played the piano since she was ten
7 been a doctor since he was 21
8 played soccer since last year
9 smoked for 2 years
10 written since she moved to England
11 worked in this factory since last month
12 planted flowers for 10 years
TP
26 tháng 2 2022
went
do - sleep
will - do
won't celebrate
stays
do - sit
does - earn
didn't watch
were
stood
buy
did - meet
reads
27 tháng 2 2022
went
do - sleep
will - do
won't celebrate
stays
do - sit
does - earn
didn't watch
were
stood
buy
did - meet
reads
a)
$Fe + H_2SO_4 \to FeSO_4 + H_2$
CT tinh thể: FeSO4.7H2O
b)
Không thể thay bằng H2SO4 60% vì với nồng độ như vậy là axit đặc nên oxi hóa Fe lên hóa trị cao nhất(hóa trị III) nên không thể tạo tinh thể FeSO4.7H2O
Cần bay hơi trong khí quyển CO2 mà không phải trong không khí vì :
$2FeSO_4 + \dfrac{1}{2}O_2 + H_2SO_4 \to Fe_2(SO_4)_3 + H_2O$
câu 3 nha mn