Cho ΔABC nhọn ,các đường cao AD,BE,CF. CMR:a, $\frac{SΔBDF }{SΔABC}$ =cos ² B

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Một vật rơi tự do không vận tốc ban đầu.từ độ cao h,biết trong giây cuối cùng nó đi được quãng đường 40m.hãy tìm h và vận tốc trước khi vật chạm đất

Nhận biết các dung dịch mất nhãn a/. Ba(OH)2, NaCl, Na2SO4 (dùng chất thử duy nhất) b/. NaOH, ZnCl2, K2SO4 ( dùng chất thử duy nhất)

Kiểm tra hộ mình với You know that Viet Nam is a country which is famous for some interesting traditional games such as hide and seek, Mandarin Square Capturing, fly a kite, Blind man's buff, … and so on. I like it because it embodies the mental values of Vietnamese people from generation to generation. With Mandarin square capturing, they drew a big rectangle consisting of 10 squares divided into 2 rows with 5 cells each. 2 ends of the rectangle draw 2 half circles Each half of the circle has 1 big stone of different colors, each square has 5 small stones, each rectangular half has the same color of stone. With tug of war, players are divided into 2 teams, grasping on both ends of the rope. When an order is given, both sides pull to see which side wins With flying kite, Children sit on buffalo backs and fly kites flying in the wind on the emormous pastures, but nowadays high-rise buildings are mushrooming make it difficult to play. With blind man's buff is played in a spacious area, such as outdoors or in a large room, in which one player, designated as "It", is blindfolded and gropes around attempting to touch the other players without being able to see them, while the other players scatter and try to avoid the person who is "it", hiding in plain sight and sometimes teasing them to influence them to change direction. But now is the 4.0 era so our world develops so much.Children don't play them, they play smart phones, computer games, surf the internet,... and so on. It made them are gradually disappearing so that we should let more people know about them or organize them in some big occasions and let's create opportunities for children to increase their understanding of Vietnamese culture and some countries in the world with fun activities and discoveries such as children performing in costumes of countries, water puppetry, puppets. shallow, making folk toys, playing folk games ... This is considered one of the new innovations to help Vietnamese children have the opportunity to access traditional games. to preserve it.

Complete the sentences with an appropriate word from the box. level - dictionary - advertisement - scenery - aspect - reputation - dormitory 1. What .... of learning English do you find difficult? 2. Most foreign students live in ....... on campus. 3. His novel won the Booker Prize and established his .......... 4. Tou can take the exam at intermediate or advanced .......... 5. If you want to sell your car, why not put an ......... in the daily paper? 6. On the way, we stopped three times to admire mountain ......... 7. I've never seen this word before. Use a ........ to look it up.

Văn hóa truyền thống Ấn Độ tác động đến Việt Nam như thế nào

Để một phoi bào sắt nặng m gam ngoài không khí, sau một t/g thu đc 12g chất rắn X gồm sắt và các oxit của sắt. Cho X tác dụng hoàn toàn với dd HNO3 loãng thấy thu đc 2,24l khí NO duy nhất (đktc) a) Viết PTHH xảy ra b) Tính m

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