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Nhớ rằng: \(\frac{n}{a.\left(a+n\right)}=\frac{1}{a}+\frac{1}{a+n}\)
Ta có: \(A=\frac{1}{2}+\frac{1}{6}+\frac{1}{12}+...+\frac{1}{90}\)
\(A=\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+...+\frac{1}{9.10}\)
Áp dụng công thức trên, ta có:
\(A=1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+...+\frac{1}{9}-\frac{1}{10}\)
\(A=1-\frac{1}{10}=\frac{9}{10}\)
1. Her name is Rosy. 2. She’s eight years old. 3. Her father is ateacher 4. Rosy’s father favorite food is fish. 5. Her mother is a nurse.
6. Rosy’s mother favorite food are vegetables and beef. 7. Her brother is six years old. 8. Rosy’s brother favorite drink is orange juice.
9. He s hamburger.
2. visit
3. play
4. works
5. doesn't work
6. don't speak
7. doesn't go
8. don't clean
9. doesn't ride
10. doesn't work
11. Does - make
12. Does - write
13. Does - speak
14. Does - phone
15. Does - play
Put the correct verb in present simple :
1. I usually go (go) to school.
2. They visit (visit) us often.
3. You play (play) basketball once a week.
4. Tom works (work) every day.
5. My father doesn't work (not work) at school.
6. You don't speak (not speak) English.
7. He doesn't go (not go) home late.
8. They don't clean ( not clean ) the bathroom.
9. Mai doesn't ride ( not ride ) her bike in the park.
10. Billy doesn't work (not work) in the supermarket.
11. Does her mother make (make) breakfast every day?
12. Does she write ( write ) a letter ?
13. Does Linda speak (speak) English?
14. Does Peter phone (phone) his father on Sundays?
15. Does Ann play (play) basketball very well?
I. PHONICS
1.A.this
2.A. small
3 B.door
4. C.who
5 D. flower
6.D.handsome
7. D.watch
8.A.brother
9. D. fall
10.A.nose B.flower C.hold D. cold
I. PHONICS
1.A.this B.thin C.thick D.thanks
2.A. small B. tall C.bad D.ball
3.A. room B.door C.school D.book
4.A.when B.why C.who D.where
5.A.nose B.cold C. hold D. flower
6.A. large B. bad C.fat D.handsome
7.A. Bay B. play C.stay D.watch
8.A.brother B.open C.so D.cold
9. A. take B. late C. table D. fall
10.A.nose B.flower C.hold D. cold
* Nếu sai thì thông cảm ạ :) *
\(A=\frac{1}{3}.\left(\frac{3}{2.4.6}+\frac{3}{4.6.8}+...+\frac{3}{22.24.26}\right)\)
\(A=\frac{1}{3}.\left(\frac{1}{2.4}-\frac{1}{4.6}+\frac{1}{4.6}-\frac{1}{6.8}+...+\frac{1}{22.24}-\frac{1}{24.26}\right)\)
\(A=\frac{1}{3}.\left(\frac{1}{2.4}-\frac{1}{24.26}\right)\)
\(A=\frac{1}{3}.\frac{77}{624}\)
\(A=\frac{77}{1872}\)
1. Where do your mother often buy this book? => Where does your mother often buy this book?
2. Are Tom studying? => Is Tom studying?
3. Hoa not have good speaking skill. => Hoa does not have good speaking skill
4. The young girl not writing the letter now. => The young girl is not writing the letter now.
5. Are Lam fond of listening music?=> Is Lam fond of listening to music?
6. They studies math=> They study math
7. What you usually do in the morning? => What do you usually do in the morning?
8. They are traveling to London. => Th ey are travelling to London.
9. The plane is land now.=> The plane is landing now
10. Why she is saying loudly?=> Why is she saying loudly?
1. Where do your mother often buy this book?
=> Where does your mother often buy this book?
2. Are Tom studying English now?
=>Is tom studying English now?
3. Hoa not have good speaking skill.
=>Hoa doesn't have good speaking skill.
4. The young girl not writing the letter now.
=> That young girl isn't writing the letter now.
5. Are Lam fond of listening music?
=> Does Lam fond of listening to music?
6. They studies math once time a week.
=> They study math once time a week.
7. What you usually do in the morning?
=> What do you usually do in the morning?
8. They are traveling to London.
=>They are travelling to London.
9. The plane is land now.
=> The plane is landing now.
10. Why she is saying loudly?
=> why is she saying loudly?
Hok tốt
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