Anh chj giúp em câu 1 với ạ
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17 tháng 3 2022
I don't know how to play the game.
This department is to the left of the post office.
Phương án 1, nhưng phải sửa là with a ball under the table.
H
0
HS
3
CV
1 tháng 8 2017
Đặt A = \(1+\frac{1}{3}+\frac{1}{6}+\frac{1}{10}+...+\frac{1}{45}\)
\(\frac{1}{2}A=\frac{1}{2}+\frac{1}{6}+\frac{1}{20}+...+\frac{1}{90}\)
\(=\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+...+\frac{1}{9.10}\)
\(=1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+...+\frac{1}{9}-\frac{1}{10}\)
\(=1-\frac{1}{10}\)
\(A=\frac{9}{10}.2\)
\(=\frac{9}{5}\)
1 tháng 8 2017
Đặt \(A=1+\frac{1}{3}+\frac{1}{6}+\frac{1}{10}+...+\frac{1}{45}\)
=> \(\frac{1}{2}A=\left(1+\frac{1}{3}+\frac{1}{6}+\frac{1}{10}+....+\frac{1}{45}\right).\frac{1}{2}\)
\(=\frac{1}{2}+\frac{1}{6}+\frac{1}{12}+\frac{1}{20}+...+\frac{1}{90}\)
\(=\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+\frac{1}{4.5}+....+\frac{1}{9.10}\)
= \(1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+\frac{1}{4}-\frac{1}{5}+.....+\frac{1}{9}-\frac{1}{10}\)
= \(1-\frac{1}{10}=\frac{9}{10}\)
=> A= 9/10:1/2=9/5
HA
Giúp em 2 bài này vs ạ các anh chj ơi=((
1
6 tháng 3 2021
Oxit là hợp chất gồm 2 nguyên tố hóa học trong đó có một nguyên tố là oxy
6 tháng 3 2021
Chắc là Oxit không ăn mòn á , bạn có thể nghiên cứu trên mạng về õit
DT
Đỗ Thanh Hải
CTVVIP
8 tháng 11 2021
I. Choose the best answer A, B, C or D to complete the following sentences.
1. The new apartment has a lot of modern things. It is well-__________
A. empty B. beautiful C. furnished D. nervous
2. Which is the national anthem of Vietnam?
A. Tieu Doan 307 B. Chien si Viet Nam C. TienQuanCa D. Tienve Ha Noi
3. Can you see any people in the house ? - __________
A. only a little B. only few C. only a few D. only little
4. __________ she plays the piano!
A. How well B. How good C. What well D. What good
5. After break, everyone goes __________ and classes start again.
A. indoor B. indoors C. outdoor D. outdoors
6. He learns _______ the guitars everyday.
A. play B. to play C. playing D. plays
7. __________ my students are familiar with this kind of school activities.
A. Most B. Most of C. A few D. Few
8. She looks like you. She __________ your sister.
A. must be B. perhaps C. must D. may
9. What is the name of the girl __________ to Mrs. Lien?
A. talk B. talks C. talking D. is talking
10. Would you __________ show me a nice picture, Ann?
A. like B. mind C. to D. please
11. Janna can’t play the piano, and Carol can’t play it __________.
A. either B. too C. neither D. as well
12. Saxophones are used mainly for __________ jazz music.
A. composing B. taking C. playing D. writing
13. I went to the 3D __________ last weekend. The paintings were excellent!
A. movie theater B. concert hall C. opera house D. art museum
14. __________ I’m not a fan of country music, I thoroughly enjoyed his lively performance.
A. Although B. Because C. As D. However
15. __________ does a water puppet show take place? ~ In a pool.
A. What B. When C.How D. Where
D
A
D
C
B
2/ B
3/ C