Khi cho lai cà chua quả đỏ với nhau F1 thu được 100% quả đỏ. Khi cho các cây cà chua quả đỏ F1 tự thụ phấn, F2 có cả quả đỏ và quả vàng. Cây cà chua quả đỏ ban đầu của bố mẹ có thuộc giống thuần chủng hay không? Vì sao?

Một cửa hàng có 5 rổ cam và quýt, trong mõi rổ chỉ có một loại quả. Số quả ở các rổ lần lượt là: 50;45;40;55;70 quả. Sau khi bán 1 rổ thì số cam còn lại gấp 3 lần số quýt. Hỏi cửa hàng còn lại bao nhiêu quả cam?bao nhiêu quả quýt?

Chia thì hỗn hợp 1. He often (go)................. to school on foot. 2. It (rain) .................very hard now. 3. The sun (warm).................... the air and (give) .....................us light. 4. Look! A man (run).................................... after the train. 5. She (go)........................... to school everyday. 6. Bad students never (work)........................... hard. 7. It often (rain) in the summer. It (rain) ..........................now. 8. The teacher always (point) ......................... at the black-board when he (want)......................... to explain something. 9. Mother (cook) ......................... some food in the kitchen at the moment, she always (cook) ......................... in the morning. 10. I always (meet) ......................... him on the corner of this street. 11. Where you (go) ......................... now?- I (go) ......................... to the theater. 12. He (not do.........................) morning exercises regularly. 13. He (do) .........................morning exercises now? 14. Water (boil) ......................... at 100 degrees centigrade. 15. He (meet) .........................the dentist next week. 16..........................you (be) ......................... a food student? 17. They usually (not go) ......................... to school by motorbike. 18. He (swim) .........................over there now. 19. She (come) ......................... here next month. 20. They (not be) ......................... doctors. 21. He often (get) ......................... up late. 22..........................you often (watch) ......................... TV? 23. Mr.Brown (listen) ......................... to music now? 24. I usually (go) (shop) .........................on the weekend. 25. Hai often (wash) ......................... his face at 6.15. 26. She (play) ......................... badminton at the moment? 27. Thanh and Mai always (see) ......................... a movie on Saturday. 28. He often (take) .........................a bus to school? 29. We (be) ......................... students in class 8A. 30. She often (not do) ......................... homework in the evening. 31. He usually (take) ......................... a taxi to the airport. 32. They usually (not go) ......................... to school by bike. 33..........................they (be) ......................... beautiful? 34. Manh (not play) ......................... soccer at the moment. 35. Minh (play) .........................chess with Nam at the moment. 36. They often (visit) ......................... their parents on Saturday. 37..........................she (study) ......................... now? 38. Mi and I always (go) ......................... to the countryside. 39. He (not be) ......................... at home now. 40. Hanh (not read) ......................... book at the moment. 41. Our teacher usually (give) .........................us many exercises. 42. He often (catch) ......................... a train to work. 43. The cat (catch) ......................... mouse. 44. They (plant) .........................trees over there at the moment. 45. My old friend, Manh (write) ......................... to me twice a month. 46. What she says (be) ......................... true. 47. Where she (buy) ......................... her breakfast every morning? 48. Bi often (not phone) ......................... to me. 49. Mrs.Green always (take) ......................... a bus to work. But now she (drive) .........................to work. 50. Look! The ball (fall) .........................down.

Tìm GTNN của $\frac{x+7}{ √x+3}$

Viết calli: " / Bae cậu luôn đẹp nhất../ " Yêu cầu: Viết tất cả trong dấu ngoặc kép ( " " ), ko app, ko ô li, ko kẻ ngang, chụp = đt, ko vi phạm luật, 1 pic kí, 1 pic ko kí, tone sáng, VD dưới hình ( nhưng đừng lấy 2 màu dưới mà vẽ á )

PRACTICE : CHOOSE THE BEST ANSWER : 1) The undergone is cheap;_____________, it’s faster than the train. A. however B. moreover C. but D. so 2) ________________ she spoke slowly, I don’t understand her. A. Since B. Although C. If D. As 3) We will wait her ____________ he comes back. A. while B. until C. since D. for 4) Our teacher explained the lesson slowly ______________ we might understand him. A. and B. so that C. if D. or 5) __________ he goes to the theatre with me, I shall go alone. A. because of B. because C. unless D. when 6) Minh had a terrible headache. __________________, he still wanted to go to school. A. Therefore B. But C. However D. Although 7) His mother was sick._________________, Jane had to stay at home to look after her. A. But B. However C. So D. Therefore 8) They asked me to wait for them; ____________, he didn’t turn back. A. but B. however C. so D. therefore 9) Many people still believe him very much __________ he sometimes tell lies. A. because B. since C. although D. despite 10) __________ the darkness in the room, we couldn’t continue our studying. A. because of B. since C. although D. in spite of

1)tanx . tan3x = 1 2) sin ( 4x - π/3 ) - cos ( 2x + π/4 ) = 0 giải giúp em với

Bỏ dấu ngoặc rồi rút gọn biểu thức a) -(-a+c-d)-(c-a+d)+a b) -(a+b-c+d)+(a-b-c-d)-a+b

có một cái sân hình vuông có chu vi 20m, người ta mở rộng sang bên phải thêm 2m .tìm chu vi sân sau khi được mở rộng

Tìm gtln D=10x-x^2-y^2-8y+2022 E= -5x^2-4x+1 Tìm gtnn E=(x-1)^2+(x-3)^2