d Bài 2: Cho tam giác ABC có AB =c , BC = a , CA=b và diện tích là S Gọi ha, , hb , hc lần lượt là độ dài đường cao qua các đỉnh A , B.C. Chứng minh rằng : 1) b²+a²>= 4 S 2) a.h + b.he+ c.ha >=6 S

Nêu ví dụ về hành vi vi phạm đạo đức nhưng không phải là hành vi không liêm chính

Cho hình hộp ABCD.A'B'C'D' biết A=( 1;0;1), B=( 2;1;2), D=(1;-1;1), C=(4;5;-5). Tính toạ độ các đỉnh còn lại của hình hộp.

giúp e zới:))) e camon nhìu ạ:3

Hãy lập bảng niên biểu những sự kiện chính trong cuộc kháng chiến chống Pháp của nhân dân ta từ năm 1858 đến 1873

IV/ Circle A, B, C or D to choose the sentence which has the same meaning as the original sentence.(2,5ms) 1. I’d prefer you to start work next month. a. I’d rather you start work next month. b. I’d rather start work for next month c. I'd rather you started work next month. d. You should start work next month. 2. This room is too small for five people a. This room is very small for five people b. This room is such small that five people can’t live in. c. This room isn’t big enough for five people. d. This room isn’t too big for five people. 3. They made me study hard when I was at school a. I was made study hard when I was at school. b. I was made to study hard when I was at school. c. I was made studying hard when I was at school d. When I was at school I studied hard. 4. You should go to the dentist’s at once. a. Don’t delay to go to the dentist’s at once. b. Don’t delay to go to the dentist’s any more. c. Don’t delay going to the dentist’s any longer. d. Don’t put off go to the dentist’s ant longer. 5. My grandfather is old, but he can walk to the park. a. Although my grandfather is old, he can walk to the park. b. Despite his old age, my grandfather can walk to the park. c. In spite of being old, my grandfather can walk to the park. d. All are correct.

phân tích so sánh khổ 1 và khổ 5 trong bài ông đồ khoảng 10 câu

viết câu tương đương 1. The cassette is still broken =>The cassette has not ... 2. You don't need to cook dinner today =>It isn't... 3. They understand more than we do =>We don't... 4. Bob finds his new contact lenses uncomfortable =>Bob isn't ... 5.We couldn't answer those two diffcult questions =>Those two questions... 6. People in many countries are watching this football match on TV =>This football match... 7. We couldn't drive because of the fog =>The fog prevented ... 8. I stopped. I bought a newspaper =>I stopped ... 9. We watched them leave . I will never forget it =>I will... 10. He drives very carefully =>He is... Giúp mik vs ạ mik đang cần gấp

1)a. (-7)^3. 2^4 b. 5^4. (-4)^2 2) a. 2x -35=15 b. 3x+17=2 c.|x-1|=0 3)Tính bằng 2 cách a. 15.12-3.5.10 b. 45-9.(13+5) c. 29.(19-13) -19.(29-13)

Chọn đáp án đúng. Giải thích giúp mình tại sao chọn đáp án đó mà không chọn 3 đáp án còn lại.