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\(A=\frac{1}{3}.\left(\frac{3}{2.4.6}+\frac{3}{4.6.8}+...+\frac{3}{22.24.26}\right)\)
\(A=\frac{1}{3}.\left(\frac{1}{2.4}-\frac{1}{4.6}+\frac{1}{4.6}-\frac{1}{6.8}+...+\frac{1}{22.24}-\frac{1}{24.26}\right)\)
\(A=\frac{1}{3}.\left(\frac{1}{2.4}-\frac{1}{24.26}\right)\)
\(A=\frac{1}{3}.\frac{77}{624}\)
\(A=\frac{77}{1872}\)
Exercise 3: Choose the best answer
1. Then, she watches films ______ dinner.
A. after
B. before
C. in
D. about
2. _________ does Erin go to the library? - Once a week
A. How
B. Where
C. How often
D. What
3. She usually goes ________.
A. jog
B. jogs
C. jogging
D. jogs
4. His new school is ______ the cinema and the museum.
A. near
B. between
C. next
D. far
5. _____ is your address in Hanoi? - It’s flat 202, third floor, Dai Hung Tower
A. What
B. Where
C. Which
D. Who
6. What does your mother do in the evening?
She ______ TV and goes to bed.
A. watch
B. watches
C. watching
D. watcher
7. How do you _____ your name?
A. spell
B. come
C. live
D. old
8. What does he do ____ break time? - He often plays soccer with his friends.
A. in
B. at
C. for
D. with
9. What’s this? - It’s ______ eraser.
A. a
B. an
C. on
D. in
Exercise 3: Choose the best answer
1. A
2. C
3. C
4. B
5. A
6. B
7. A
8. B
9. B
* Saii srr bn nha
english
math
IT (Information Technology)
PE (Physical Education)
Art
Music
Sport shop
Sports shop
\(\rArr\) Tất cả là chỉ phương hướng còn Sports shop chỉ nơi chốn.