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Enjin
Enjin

Enjin
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Điểm SP 439

Người theo dõi (11)

тримайся подалі від мене
тримайся подалі від мене
Nguyễn Khánh Linh
Nguyễn Khánh Linh
hoàng nguyễn bảo lan
hoàng nguyễn bảo lan
Enjin
Enjin
꧁༒ɳɡọͼ•ɧà༒꧂
꧁༒ɳɡọͼ•ɧà༒꧂

Đang theo dõi (2)

тримайся подалі від мене
тримайся подалі від мене
Enjin
Enjin

Enjin

Câu trả lời:

a,Xét \(\Delta\) ADC và \(\Delta\) ABE:

AD = AB (GT)

AC = AE (GT)

\(\widehat{DAC}=\widehat{BAE}\) 

=> \(\Delta\)ADC = \(\Delta\)ABE (c.g.c)

=> CD = BE (t/ứng)

b,Gọi I là giao điểm của CD và AB.

Gọi K là giao điểm của CD và BE.

Từ \(\Delta\)ADC = \(\Delta\)ABE (cmt), ta có

\(\widehat{ADC}=\widehat{ABE}\)

Xét \(\Delta\) ADI, ta có:
\(\widehat{AID}+\widehat{ADI}+\widehat{DAI}=180^o\)

=> \(\widehat{AID}+\widehat{ADI}=90^o\)

Mà \(\widehat{ADI}=\widehat{ABE}\), nên \(\widehat{AID}+\widehat{ABE}=90^o\)

Xét \(\Delta\)BKI, ta có:

\(\widehat{KBI}+\widehat{BIK}+\widehat{IKB}=180^o\)

Mà \(\widehat{IKB}=\widehat{ABE}\) và \(\widehat{BIK}=\widehat{AID}\)

nên \(\widehat{ABE}+\widehat{AID}+\widehat{IKB}=180^o\)

=> \(90^o+\widehat{IKB}=180^o\)

Vậy \(\widehat{IKB}=90^o\)

=>CD \(\perp\) BE.
Enjin

Câu trả lời:

1B

2C

3A

4D

5A

6D

7A

8A

9B

10A

11D

12C
Enjin
Enjin
Enjin
Enjin

Câu trả lời:

KIỂM TRA HỌC KỲIIMÔN TIẾNG ANH LỚP 6I. Pronunciation(1 pt)A. Choose the word whose underlined part is pronounced differently from that of the others.1. A. check B. choose C. chemistry D. chance2. A. house B. happy C. how D. hourB. Choose the word whose main stress pattern is not the same as that of the others.1. A. campsite B. dolphin C. exciting D. waterfall2.A. question B. selection C. apartment D. professionalII.Choose the correct answer.(2.5 pts)1. What is the difference ____________ African and Asian elephants?A. on B. in fron of C. between D. next to2. Phanxipang is ___________ mountain in Viet Nam.A. high B. higher C. highest D. the highest3. Ha Noi is bigger ____________ Ho Chi Minh City. A. more B. than C. then D. and4. ____________ are you going to stay in Hue? -About 2 weeks.A. How long B. How far C. How heavy D. How deep5. I’m hungry now. Let’s _____________ to the canteen.A. to go B. going C. go D. goes6. Nam is going ___________ his camera and take some photos.A. bring B. to bring C. bringing D. brings7. __________ kill more people in Africa than any other animal.A. Mosquitoes B. Box jellyfish C. Hippos D. Snacks8. Mekong River _______________ Red River.A. long B.longer C. longer than D. is longer thanIII. Read. A.Fill in the blanks (1 pt)beautiful –climbing -for –fishing –lakes –mountains –hills -visit –west –the.Yosemite National Park is in California, in the (1) .west.... of the USA. The park is very big. It is 3,080 km2 . Yosemite has got lots of (2) .beautiful... scenery and many rare animals. There are some very high (3) ..mountains... –Some of them are over 4,000 metres high. There are also woods, rivers and thousands of small (4) ..lakes.. But Yosemite is especially famous (5)..for... its beautiful waterfalls. One of (6)....the....waterfalls is 739 metres high! Overthere million people (7) ...visit.... Yosemite every year. You can go (8) .climbing.. in the mountains, and walking in the (9).hills... . People also go canoeing and (10) ..fishing... on the lakes.B.Read the passage carefully (2 pts)GIANT PANDASPandas are mammals. They live in jungles of China. We can find them in cold regions of jungle, but that doesn’t mean that they live in cold places. It is very hot and humid in the jungle. Pandas have got long black and white fur. They always look very sad. They grow up to two metres. They eat bamboo, plants and sometimes fish. They are omnivore –animals that eat plants and meat. There are less than 1000 left in the wild. They are in danger of becoming extinct because people are destroying their habitat –the place where they live. Farmers want more and more land to grow different products, so they cut down lots of bamboo and change the bamboo forest into a field. Pandas are also killed for their fur to make rugs.A panda is also a symbol WWF organization. This organization tries to look after wild animals, plants and the place where they live.A. Choose True or False (1.0 pt)T/F1. We can find pandas in jungles of China.__T___2. Panda can eat bamboo, plants or fish.___T__3. People killed Pandas for their meat.__F___4. Pandas are in danger because people are destroying the place where they live. ___T___B.Answerthe questions (1.0 pt)P1:

1A panda has got long black and white fur.

2Farmers want more and more land to grow different products.

IV. Writing (3.5 pts)

P1

1Who is the most intelligent person in your family?

2How tall is the girl?

3You can go walking, sailing and climbing in the hills and go swimming on the lakes.

4She worked in a bank two years ago.

Part 2: Imagine you are on holliday. Write a postcard to your friend. (1.5)-Say “Hi ...”, “Dear...”-Say where you are-Say what the place like and what the weather is like-Say what type of accomodation you are staying-Say what is in the picture-Say about the activities you can do there.-Say “Goodbye”(cái này tự làm nha^^...)
Enjin

Câu trả lời:

Ô tô đi từ 6h 30' -> 11h 15', tức là mất 4h 45'

Đổi 4h 45' = 4,75h

15'=0,25h

Thời gian ô tô thực sự chạy thực tế là:

4,75h - 0,25h = 4,5h

\(V=\dfrac{180}{4,5}=40\)km/h

Quãng đường ô tô đã đi chính là khoảng cách giữa hai thành phố là 180 km.
Enjin

Câu trả lời:

Đổi 3 giờ = 180 phút

=> Vận tốc = \(\dfrac{1500}{180}=\dfrac{25}{3}\approx8,33km\)/phút
Enjin

Câu trả lời:

Đổi \(0,6 m = 6 dm\)

Vì mỗi dm của khối kim loại nặng 12 kg, nên khối kim loại dài 6 dm sẽ nặng:

\(6 . 12 = 72 kg\)
Enjin

Câu trả lời:

a) Sxq bể cá:

\((80 + 50) . 2 . 45 = 11700 (cm²)\)

S đáy bể cá:

\(80 . 50 = 4000 (cm²)\)

S kính dùng làm bể cá:

\(11700 + 4000 = 15700 (cm²)\)

b)  V hòn đá:

\(80 . 50 . 3,5 = 14000 (cm³)\)