Nếu ΔABC vuông tại A thì:
A.\(BC^2\)=\(AB^2\)+\(AC^2\)
B.\(AC^2=AB^2+BC^2\)
C.\(AB^2=BC^2+AC^2\)
D.\(BC^2\)=\(AC^2+AB^2\)
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có ai biết tính từ của read ko ạ????
Bạn tham khảo:
mk chx chắc lắm đou nha
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Cho tam giác ABC cân tại A, đường phân giác trong của góc C cắt AB tại E và cho biết AC = 20cm, BC = 15cm. Khi đó AE =?
A. 5/4 cm
B. 4/5 cm
C. 80/7 cm
D. 7/80 cm
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VI. Read and choose the correct answer A, B, C or D for each of the gaps: People of (1)……….……… minorities in Phu Yen celebrate Hoi Mua Festival every March. It is held (2)…………….. the Rice God for the crop, and to pray for better crops in the future. Families also worship their ancestors and parents (3)…………… this occasion. Villagers voluntarily contribute money and other things to celebrate the (4)……………… . In this festival monks are invited to preach. People (5)…………..… drums, sing songs and dance...
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VI. Read and choose the correct answer A, B, C or D for each of the gaps:
People of (1)……….……… minorities in Phu Yen celebrate Hoi Mua Festival every March. It is held (2)…………….. the Rice God for the crop, and to pray for better crops in the future. Families also worship their ancestors and parents (3)…………… this occasion. Villagers voluntarily contribute money and other things to celebrate the (4)……………… . In this festival monks are invited to preach. People (5)…………..… drums, sing songs and dance. They also drink rice wine through a long thin bamboo tube. There are some other activities such as cultural shows, buffalo races, and traditional games. The festive (6)…………..……. is felt around all the villages.
1. A. village B. ethnic C. villagers D. country
2. A. to thank B. to say C. to do D. to make
3. A. on B. at C. in D. for
4. A. festive B. celebrate C. festival D. celebration
5. A. do B. dance C. see D. play
6. A. animal B. atmosphere C. people D. river
Những điều kiện làm cho nền nông nghiệp Bắc Mỹ phát triển mạnh và đạt đến trình độ cao?
refer
+ Nền nông nghiệp
- Tỷ lệ lao động trong nông nghiệp rất thấp ( 4,4% ở Hoa Kỳ, 2,7% ở Canada ).
- Năng suất lao động cao, sản xuất ra khối lượng rất lớn.
+ Công nghệ sinh học được ứng dụng mạnh mẽ trong sản xuất nông nghiệp.
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tham khảo
-Những điều kiện làm cho nền nông nghiệp bắc mỹ đạt đến trình độ cao là
-nhờ điều kiện tự nhiên thuận lợi và kĩ thuật tiên tiến.
-Hơn nữa, các nước như Hoa Kì và Ca-na-đa có tỉ lệ lao động trong nông nghiệp rất thấp nhưng ngược lại, những nước này lại sản xuất ra khối lượng nông sản rất lớn.
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\(n_S=\dfrac{6,4}{32}=0,2\left(mol\right)\)
\(n_{O_2}=\dfrac{11,2}{22,4}=0,5\left(mol\right)\)
PTHH: S + O2 --to--> SO2
Xét tỉ lệ: \(\dfrac{0,2}{1}< \dfrac{0,5}{1}\) => S hết, O2 dư
PTHH: S + O2 --to--> SO2
0,2-->0,2------->0,2
=> \(m_{SO_2}=0,2.64=12,8\left(g\right)\)
\(m_{O_2\left(dư\right)}=\left(0,5-0,2\right).32=9,6\left(g\right)\)
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5 tháng 3 2022 lúc 21:31
Rút gọn rồi tính các phân số sau:
8/24 - 5/25 18/21 - 12/27
giúp mình với, trả lời mình tick cho nhé
\(\dfrac{8}{24}-\dfrac{5}{25}=\dfrac{1}{3}-\dfrac{1}{5}=\dfrac{5}{15}-\dfrac{3}{15}=\dfrac{2}{15}\\ \dfrac{18}{21}-\dfrac{12}{27}=\dfrac{6}{7}-\dfrac{4}{9}=\dfrac{54}{63}-\dfrac{28}{63}=\dfrac{26}{63}\)
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20.222-40.44x2021+20.212
I. Write the sentences using the suggested words (0.75 pt). 1. How far / it / the city centre / the beach?_________________________________________________________2. Titanic film/ romantic/ and/ sad/._________________________________________________________3. The end/ the film/ moving._________________________________________________________II. Put the words in the correct orders to make the meaningful sentences (0.75 pt).1. carnival / Rio / has / famous / the / most / in / the / wo...
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I. Write the sentences using the suggested words (0.75 pt).
1. How far / it / the city centre / the beach?
_________________________________________________________
2. Titanic film/ romantic/ and/ sad/.
_________________________________________________________
3. The end/ the film/ moving.
_________________________________________________________
II. Put the words in the correct orders to make the meaningful sentences (0.75 pt).
1. carnival / Rio / has / famous / the / most / in / the / world/.
_________________________________________________________
2. stamps / a child / Minh / since / collected / was / has / he/.
_________________________________________________________
3. did/ last year’s carnival/ do/ What/ at/ you/?
_________________________________________________________
III. Finish each sentence so that it means the same as the sentence before it (1.0 pt).
1.He didn’t win an Oscar for Best Actor although he performed excellently.
Despite …………………………………………………………………….
_________________________________________________________
2. I think it is uncomfortable to travel by bus.
I found traveling…………………………………………………………..
_________________________________________________________
I. Write the sentences using the suggested words (0.75 pt).
1. How far / it / the city centre / the beach?
How far is it from the city center to the beach?
2. Titanic film/ romantic/ and/ sad/.
Titanic film is romantic and sad
3. The end/ the film/ moving.
The end of the film is moving
II. Put the words in the correct orders to make the meaningful sentences (0.75 pt).
1. carnival / Rio / has / famous / the / most / in / the / world/.
Rio has the most famous carnival in the world
2. stamps / a child / Minh / since / collected / was / has / he/.
Minh has collected stamps since he was a child
3. did/ last year’s carnival/ do/ What/ at/ you/?
what did you do at last year's carnival?
III. Finish each sentence so that it means the same as the sentence before it (1.0 pt).
1.He didn’t win an Oscar for Best Actor although he performed excellently.
Despite performing excellently, he didn't win an Oscar for Best Actor
2. I think it is uncomfortable to travel by bus.
I found traveling………by bus uncomfortable ………..
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I.1.How far is it from the city centre to the beach?
2.Titanic film is romantic and sad one.
3. The end of the film is moving
II.1.Rio has the most famous carnival in the world.
2.Minh has collected stamps since he was a child.
3.What did you do at last year's carnival ?
III.1.Despte performing excellently, he didn’t win an Oscar for Best Actor.
2.I found traveling by bus is uncomfortable.
đề này là đề thi kiểm tra giữa kì môn tiếng anh đúng ko mình thi đề này rồi
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a: HK/AC=1,2/5=6/25
b: Xét ΔBAC có HK//AC
nên HK/AC=BK/BC
=>\(\dfrac{BK}{BK+13}=\dfrac{6}{25}\)
=>25BK=6BK+78
=>19BK=78
=>BK=78/19(cm)
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