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\(A=\frac{1}{3}.\left(\frac{3}{2.4.6}+\frac{3}{4.6.8}+...+\frac{3}{22.24.26}\right)\)
\(A=\frac{1}{3}.\left(\frac{1}{2.4}-\frac{1}{4.6}+\frac{1}{4.6}-\frac{1}{6.8}+...+\frac{1}{22.24}-\frac{1}{24.26}\right)\)
\(A=\frac{1}{3}.\left(\frac{1}{2.4}-\frac{1}{24.26}\right)\)
\(A=\frac{1}{3}.\frac{77}{624}\)
\(A=\frac{77}{1872}\)
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.
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.
Bạn ấn vô gõ công thức toán và nó có các dòng công cụ
Bạn đếm đến cái thứ 12 có hình \(\frac{\Rightarrow}{\approx}\)như vậy là nó có dấu \(\times\)như vậy nà
|
| D | F | E | O | S | K | U | L |
| E | L | E | P | H | A | N | T |
| Z | O | O | T | A | N | D | C |
| X | R | A | I | T | G | O | E |
| T | A | Y | G | M | A | C | O |
| Y | D | B | E | A | R | T | M |
| D | I | J | R | T | O | U | A |
| I | O | V | A | U | O | R | T |
Trả lời :
= 7
Còn cách làm tham khảo Kiều Anh nha
#Mập
V.Read and circle a , b or c.
Hi , my name is Peter .This is my grandma . She is 75 years old. She can remember all the phone numbers of my family members. My father’s phone number is 0989087652 . My mother’s phone number is 0912388878 . My brother’s phone number is 01020304050 . But my grandma can’t remember her phone number because she never calls it.What is your phone number ? Can you remember it ?
1. Peter’s grandma is …………………….
a .sixty – five b. seventy – five c . eight- five d.fifty-five
2. His grandma can remember all the ………………… of the family members.
a. names b. jobs c.phone numbers d.numbers
3. His ……………………. phone number is 0989087652.
a. father’s b. mother’s c . brother’s d.sister’s
4. His ……………………. phone number is 0912388878.
A . father’s b. grandmother’s c . brother’s d. mother’s
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?
ok
không viết bình thường được à
ioe dễ mà tao làm xog vòng 14 rồi dod
mik còn chx lm xog vòng 10:)))
Đoán vội 2k18 🤦♂️🤦♂️
Bạn ơi, câu hỏi của bạn đâu vậy?
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