K
Khách
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
TC
1
Những câu hỏi liên quan
LN
1
DT
Đỗ Thanh Hải
CTVVIP
27 tháng 11 2021
1 were - would you play
2 weren't studying - would have
3 had taken - wouldn't have got
4 would you go - could
5 will you give - is
6 recycle - won't be
7 had heard - wouldn't have gone
8 would you buy - had
9 don't hurry - will miss
10 had phoned - would have given
11 were - wouldn't eat
12 will go - rains
13 had known - would have sent
14 won't feel - swims
15 hadn't freezed - would have gone
HT
0
MD
0
PT
0
LN
1
DT
Đỗ Thanh Hải
CTVVIP
27 tháng 11 2021
1 had stayed
2 were
3 arrive
4 would have bought
5 would go
6 comes
7 had thought
8 gets
9 will become
10 had known
11 hurries
12 would change
13 would have trusted
14 doesn't study
15 weren't
MT
0
\(A=\frac{\frac{1}{2}+\frac{1}{3}+...+\frac{1}{2021}}{2020+\frac{2019}{2}+...+\frac{1}{2020}}\)
\(=\frac{\frac{1}{2}+\frac{1}{3}+...+\frac{1}{2021}}{1+\left(\frac{2019}{2}+1\right)+\left(\frac{2018}{3}+1\right)...+\left(\frac{1}{2020}+1\right)}\)
\(=\frac{\frac{1}{2}+\frac{1}{3}+...+\frac{1}{2021}}{\frac{2021}{2021}+\frac{2021}{2}+\frac{2021}{3}+...+\frac{2021}{2020}}\)
\(=\frac{\frac{1}{2}+\frac{1}{3}+...+\frac{1}{2021}}{2021\left(\frac{1}{2}+\frac{1}{3}+...+\frac{1}{2021}\right)}=\frac{1}{2021}\)
Vậy \(A=\frac{1}{2021}\).