a.tính diện tích của hình tam giác có đáy là 23 cm chiều cao 3 dm. b. tính diện tích của hình tam giác có đáy là 3,6cm. chiều cao bằng 5/9 độ dài đáy.

Tại sao sinh sản hứu tính lại tạo ra được các cá thể mới đa dạng về đặc điểm di truyền?

CMR:10^n+18n-28 chia het cho 27

Giúp em bài 1 phần hình học với ạ

Cho tam giác ABC vuông ở A, M là trung điểm AC. Kẻ tia Cx vuông góc với CA (tia Cx và điểm B ở hai nửa mặt phẳng đối nhau bờ AC). Trên tia Cx lấy điểm D sao cho CD = AB. Chứng minh ba điểm B, M, D thẳng hàng. CAC BAN VE HINH HO MIK NHE!!!!

Bài 3. There is one mistake in each sentences, try to find the mistake and correct it 1. The show helps me remembering my childhood ................................................................................. 2. Animal programme tell us about the life of animals in the world ................................................................................. 3. Although my sister loves comedy, but she doesn't have time to watch it .................................................................................. 4. This film is very famous in China but not much Vietnamese know it ................................................................................... 5. What kind of TV programme does your grandfather like most? ....................................................................................

Anh Nam dùng 2,4dm2 tôn cắt thành một cái thùng hình lập phương có chu vi đáy là 24dm. Tính diện tích miếng tôn còn lại

Exercise 8 1. They________ tomorrow at 12:30 a. will leave b. are leaving c. are going to leave d. leave 2. Someone________ at the door, can you answer it? a. knocks b. is knocking c. has knocked d. knocked 3. John________ at the moment, so he can't answer the telephone. a. works b. is working c. has worked d. will work 4. The river________ after last night's rain. a. flowed b. flows c. is flowing d. will flow 5. He________ for Chelsea this season. a. played b. is playing c. would play d. has played 6. We shall make a trip around the world when the opportunity________ itself to us. a. will present b. will have presented c. presents d. will be presenting 7. This pupil________ his best and ________ only one mistake in his dictation. a. made/did b. did/made c. made/made d. did/did 8. The holiday makers________ in the sunshine to get sunburnt. a. laid b. lied c. led d. laying 9. The snake________ one big egg last week. a. lay b. laid c. led d. laying 10. I'm afraid you________ number. a. have mistaken b. are with the wrong c. have the wrong d. made the wrong 11. I like looking at the pictures, but I ________ enough by lunch time. a. should have b. will have c. will have had d. have 12. I don't understand this sentence. What________? a. does mean this word b. have this word mean c. means this word d. does this word mean 13. John________ tennis once or twice a week. a. usually play b. in usually playing c. usually plays d. have usually played 14. It was noisy next door. Our neighbors________ a party a. had b. were having c. had had d. have had 15. It________ dark. Shall I turn on the light? a. is getting b. get c. got d. has got 16. I________ for Christine. Do you know where she is? a. look b. looked c. am looking d. looks 17. At 5 o'clock yesterday evening, I ________ my clothes. a. am ironing b. have ironed c. ironed d. was ironing 18. Are you ready, Ann? Yes, I________ a. am coming b. come c. came d. have came 19. Why________ at me like that? What's the matter? a. do you look b. have you looked c. did you look d. are you looking 20. I________ along the street when I suddenly heard footsteps behind me. a. was walking b. a walking c. walk d. walked Exercise 9 1. There was a time when watching TV really________ family entertainment a. were b. was c. had been d. is 2. Last year they __________ 22 million TV sets. a. were selling b. has sold c. has sold d. sold 3. At last the bus came. We _________ for half an hour a. waited b. was waiting c. have waited d. had been waiting 4. Through the rain, I ______ a lighted window and a sign wich said "Sam's Place".

Moi nguoi giup em voi, em can gap lam, giup em voi moi nguoi oi

Tổng của số nguyên âm lớn nhất có hai chữ số với số nguyên dương lớn nhất có hai chữ số