Chiếu một tia tới đến gương phẳng .Biết góc tới i = 30°, tia phản xạ hợp với mặt gương một góc bằng bao nhiêu? Vẽ ra cho mình vs ạ

Calli tên 3 mod bạn quý nhất Hoidap (đúg font)

Vẽ chibi buồn Màu, line, có tâm, luật NL: có 3 lá hay cỏ 4 lá mới là biểu tượng may mắn nhể

Choose the best anwer : 1.There is not a lot of worldnews in this newspaper. a.crowded b.international c.urban d.local 2.At weekends the city is always packed with people. a.crowded b.international c.urband.local 3.Once you’ve finished cleaning, you can go on with your work a.examine b.make a note c.consider d.continue 4.___his poor English, he managed to communicate his problem very clearly. a. Although b. Even though c. though d. In spite of 5.London is one of ___ cities in the world a.large b.largest c.the largestd.larger 6.The city has recently ___a library in the West Suburb. a.set out b.set up c.set off d.set in 7.This sports centre is so small that it cannot ______ the demands of local residents. a.keep up with b.face up to c.deal about d.set up 8.__ she’s young,she’s the most famous artisan in the village. a.When b.Although c.Whereas d.In order to 9. Mr.Cuong wishes he ____enough money now to buy his mother a new house. a. has b. will have c. had d. has had 10. The children suggest __ soccer after school. Cần Gấp !

Cho tam giác ABC nhọn (AB < AC). Gọi M là trung điểm của AC. Trên tia đối MB lấy điểm D sao cho MB = MD. b) Vẽ AH vuông góc BC (H thuộc BC). Chứng minh AH ^vuông gócAD. c) Chứng minh góc ABC=góc CBD huhu giải kiểu lớp 7 giúp mình nha!!!

tính a, √50 - √ 18 + √200 - √ 162

Ai giải vs em dc ko ạ đang cần gấp

I. Choose A, B, C or D to indicate the correct answer to each of the following questions. 1. Many rare and precious species are now the verge of extinction. A. in B. on C. from D. by 2. The overall aim of the book is to help bridge the gap between theory and practice, particularly in language teaching. The phrase “bridge the gap” is closest in meaning to . A. minimize the limitations B. construct a bridge C. reduce the differences D. increase the understanding 3. I don’t like a few things about my job, but it is quite enjoyable. A. by and large B. by mistake C. sooner or later D. what is more 4. It is for us to do anything about the chaotic traffic. A. out of date B. without delay C. out of the question D. out of order 5. I just couldn’t remember her name even though it was on the of my tongue. A. edge B. tip C. top D. front 6. When you do something, you should_ . A. get through to it B. turn over a new leaf C. weigh up the pros and cons C. go down well with 7. I realized that he was a thief. A. sooner or later B. all along C. at the beginning D. eventually 8. Even if you are rich, you should save some money for a day. A. windy B. stormy C. rainy D. cloudy 9. I do wish you’d stop biting your nails, John. It really . A. lets me down B. tells me off C. gets me down D. gets on my nerves 10. My father when he found out that I’d damaged the car. A. hit the roof B. saw pink elephants C. made my blood boil D. brought the house down

Pls help me :((((((((((((((((((

để chuẩn bị cho đại hội lên đội cô tổng phụ trách yêu cầu ban chỉ huy làm 1 hòm phiếu hình lập phương cạnh 60cm rồi trang trí hòm phiếu bằng cách dán giấy màu kín 6 mặt ngoài dsao cho không có 2 mặt liền nhau cùng dán 1 giấy màu a) tính diện tích giấy màu cần dùng để dán hòm phiếu b) cần ít nhất mấy màu để trang trí hồm phiếu theo yêu cần của cô phụ trách