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10 tháng 11 2021

Ủa đề đâu 

11 tháng 11 2021

?????????

17 tháng 3 2022

giải dùm mình với

 

30 tháng 4 2016

Bạn xem lời giải của mình nhé:

Giải:

\(S=\frac{1}{5}+\left(\frac{1}{13}+\frac{1}{14}+\frac{1}{15}\right)+\left(\frac{1}{61}+\frac{1}{62}+\frac{1}{63}\right)\\ \frac{1}{13}< \frac{1}{12}\\ \frac{1}{14}< \frac{1}{12}\\ \frac{1}{15}< \frac{1}{12}\\ \frac{1}{61}< \frac{1}{60}\\ \frac{1}{62}< \frac{1}{60}\\ \frac{1}{63}< \frac{1}{60}\)

\(\Rightarrow\frac{1}{5}+\left(\frac{1}{13}+\frac{1}{14}+\frac{1}{15}\right)+\left(\frac{1}{61}+\frac{1}{62}+\frac{1}{63}\right)< \frac{1}{5}+\left(\frac{1}{12}+\frac{1}{12}+\frac{1}{12}\right)+\left(\frac{1}{60}+\frac{1}{60}+\frac{1}{60}\right)\)

\(\Rightarrow A< \frac{1}{5}+\frac{1}{12}.3+\frac{1}{60}.3\\ \Rightarrow A< \frac{1}{5}+\frac{1}{4}+\frac{1}{20}\\ \Rightarrow A< \frac{4+5+1}{20}\\ \Rightarrow A< \frac{1}{2}\left(đpcm\right)\)

Chúc bạn học tốt!hihi

30 tháng 4 2016

day la toan mak

19 tháng 11 2019

PSS 2-0 FTS

21 tháng 4 2016

Đây là toán mà sao lại ở đây?batngo

21 tháng 4 2016

Toán mà soa lại là ngoại ngữ dc.batngo

Choose the word whose stress is different from the others1. *1 điểmusualpollutionsectionscenic2. *1 điểmrevisioncongestionmountainsuggestion3. *1 điểmmathematicinvitationconsiderationcelebration4. *1 điểmtacticattractionconstructionconnection5. *1 điểmathleticenergeticscientificinvitationChoose the correct answer6. We often go fishing _________ the weekend. *1 điểmfromwhilebetweenduring7. Sarah and I should _________ this homework before 9.00 p.m. *1 điểmmaketakedoplay8. My...
Đọc tiếp

Choose the word whose stress is different from the others

1. *

1 điểm

usual

pollution

section

scenic

2. *

1 điểm

revision

congestion

mountain

suggestion

3. *

1 điểm

mathematic

invitation

consideration

celebration

4. *

1 điểm

tactic

attraction

construction

connection

5. *

1 điểm

athletic

energetic

scientific

invitation

Choose the correct answer

6. We often go fishing _________ the weekend. *

1 điểm

from

while

between

during

7. Sarah and I should _________ this homework before 9.00 p.m. *

1 điểm

make

take

do

play

8. My cousins went to the movie theater yesterday, ___________. *

1 điểm

neither do I

So do I

neither did I

so did I

9. We won’t cancel our plans for you *

1 điểm

he won't too

he isn't either

neither won't he

he won't either

10. No one wants to go camping because it's raining outside. ________________. *

1 điểm

So do we

Neither do we

we too

we want either

Choose the correct Wh - question

11. _____________ did you last see him? - At the movie theater. *

1 điểm

Where

When

How

What

12. _________ does it take you to go to school every day? *

1 điểm

How far

How long

How much

How many

13. ____________ do you go on summer vacation with? - Nhan and Trang. *

1 điểm

What

When

Whom

How

14. ____________ didn't you go to school yesterday? - I was sick. *

1 điểm

How

When

What

Why

15. _________ is it from your house to the supermarket? *

1 điểm

How far

How long

How distance

How much

Identify the stress of these following words

16. Mathematician *

1 điểm

1

2

3

4

5

17. cooperation *

1 điểm

1

2

3

4

5

18. concentration *

1 điểm

1

2

3

4

5

19. Indonesian *

1 điểm

1

2

3

4

5

10. selection *

1 điểm

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2

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4

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Choose the word whose stress is different from the others1. *1 điểmusualpollutionsectionscenic2. *1 điểmrevisioncongestionmountainsuggestion3. *1 điểmmathematicinvitationconsiderationcelebration4. *1 điểmtacticattractionconstructionconnection5. *1 điểmathleticenergeticscientificinvitationChoose the correct answer6. We often go fishing _________ the weekend. *1 điểmfromwhilebetweenduring7. Sarah and I should _________ this homework before 9.00 p.m. *1 điểmmaketakedoplay8. My...
Đọc tiếp

Choose the word whose stress is different from the others

1. *

1 điểm

usual

pollution

section

scenic

2. *

1 điểm

revision

congestion

mountain

suggestion

3. *

1 điểm

mathematic

invitation

consideration

celebration

4. *

1 điểm

tactic

attraction

construction

connection

5. *

1 điểm

athletic

energetic

scientific

invitation

Choose the correct answer

6. We often go fishing _________ the weekend. *

1 điểm

from

while

between

during

7. Sarah and I should _________ this homework before 9.00 p.m. *

1 điểm

make

take

do

play

8. My cousins went to the movie theater yesterday, ___________. *

1 điểm

neither do I

So do I

neither did I

so did I

9. We won’t cancel our plans for you *

1 điểm

he won't too

he isn't either

neither won't he

he won't either

10. No one wants to go camping because it's raining outside. ________________. *

1 điểm

So do we

Neither do we

we too

we want either

Choose the correct Wh - question

11. _____________ did you last see him? - At the movie theater. *

1 điểm

Where

When

How

What

12. _________ does it take you to go to school every day? *

1 điểm

How far

How long

How much

How many

13. ____________ do you go on summer vacation with? - Nhan and Trang. *

1 điểm

What

When

Whom

How

14. ____________ didn't you go to school yesterday? - I was sick. *

1 điểm

How

When

What

Why

15. _________ is it from your house to the supermarket? *

1 điểm

How far

How long

How distance

How much

Identify the stress of these following words

16. Mathematician *

1 điểm

1

2

3

4

5

17. cooperation *

1 điểm

1

2

3

4

5

18. concentration *

1 điểm

1

2

3

4

5

19. Indonesian *

1 điểm

1

2

3

4

5

10. selection *

1 điểm

1

2

3

4

1
13 tháng 8 2021

Choose the word whose stress is different from the others

1. *

1 điểm

usual

pollution

section

scenic

2. *

1 điểm

revision

congestion

mountain

suggestion

3. *

1 điểm

mathematic

invitation

consideration

celebration

4. *

1 điểm

tactic

attraction

construction

connection

5. *

1 điểm

athletic

energetic

scientific

invitation

Choose the correct answer

6. We often go fishing _________ the weekend. *

1 điểm

from

while

between

during

7. Sarah and I should _________ this homework before 9.00 p.m. *

1 điểm

make

take

do

play

8. My cousins went to the movie theater yesterday, ___________. *

1 điểm

neither do I

So do I

neither did I

so did I

9. We won’t cancel our plans for you *

1 điểm

he won't too

he isn't either

neither won't he

he won't either

10. No one wants to go camping because it's raining outside. ________________. *

1 điểm

So do we

Neither do we

we too

we want either

Choose the correct Wh - question

11. _____________ did you last see him? - At the movie theater. *

1 điểm

Where

When

How

What

12. _________ does it take you to go to school every day? *

1 điểm

How far

How long

How much

How many

13. ____________ do you go on summer vacation with? - Nhan and Trang. *

1 điểm

What

When

Whom

How

14. ____________ didn't you go to school yesterday? - I was sick. *

1 điểm

How

When

What

Why

15. _________ is it from your house to the supermarket? *

1 điểm

How far

How long

How distance

How much

28 tháng 4 2016

Đề hỏi gì

28 tháng 4 2016

cho hỏi đề của bài này

19 tháng 4 2016

Bài 1 :

\(S=\frac{2}{1.2.3}+\frac{2}{2.3.4}+...+\frac{2}{2009.2010.2011}\)

    \(=\frac{1}{1.2}-\frac{1}{2.3}+\frac{1}{2.3}-\frac{1}{3.4}+...+\frac{1}{2009.2010}-\frac{1}{2010.2011}\)

    \(=\frac{1}{1.2}-\frac{1}{2010.2011}<\frac{1}{2}\)

Vậy \(S<\frac{1}{2}\)

Bài 2:

Làm nhiều rồi vào trong chỗ góc học tập của tớ mà coi ok

19 tháng 4 2016

THANKS BN NHÌU