Cho tâm giác ABC nhọn. M là trung điểm AC,N là trung điểm BC a)chứng mính tứ giác AMNB là hình thang. Tính AB biết MN=10cm b)cho I là trung điểm AB. Chứng minh NI song song AC c)chứng minh tứ giác AMNI là hình bình hành làm càng nhanh càng tốt nha em cảm ơn ạ

làm nhanh bài 2, trước 7h5p Cảm ơn !

Choose the correct answer to complete the sentences below. 1. Surgeons use a ______________ to perform an operation. A. scalpel B. razor blade C. sword D. knife 2. He is always busy. He has ______________ time to relax. A. much B. a little C. little D. few 3. She’s running slowly through the park. She’s ______________. A. walking B. riding C. jogging D. driving

Cho tứ giác ABCD, xét hai mệnh đề: P: " ABCD có tổng hai góc đối bằng 180°" Q: " ABCD là tứ giác nội tiếp." Phát biểu mệnh đề P ⇒ Q và cho biết tính đúng, sai của mệnh đề.

Một hình chữ nhật biết nếu giảm chiều dài chiều rộng mỗi chiều giảm 5cm thì diện tích giảm 150cm . Tìm chu vi hình chữ nhật đó

Biết x,y,z tỉ lệ thuận với 4;7;10 và 2x+3y+4z=69. Em hãy tìm 3 số x,y,z.

Cho a là số nguyên tố p>5 , k là số nguyên dương chứng minh a^4k -1 chia hết cho 240

Give the correct form of the verbs in brackets. 1. After (check) _________________ the document carefully, she (send) _________________ it to her boss. 2. (Bake) _________________ the cake, she (cool) _________________ it before (put) _________________ it into the fridge. 3. It’s time you (revise) _________________ for your coming exam, David. (Not just spend) _________________ your time (play) _________________ computer games. 4. (Promote) _________________, you have to try harder. 5. She imagines (study) _________________ overseas one day. 6. It’s no use (give) _________________ him a call at this hour. He (not go) _________________ out as he (be) _________________ in bed already. 7. Jane (come) ________________ across her teacher yesterday while (shop) _________________ for clothes at the mall. 8. I don’t want (treat) _________________ like a child. I’m grown up already. 9. It (say) _________________ that the whole world (undergo) _________________ a lot of ups and downs as a result of the pandemic soon. 10. (See) _________________ is (believe) _________________.

Mn làm giúp e với ạ Làm theo hệ thức tam giác ạ

Choose the correct answer to complete the sentences below. 1. Surgeons use a ______________ to perform an operation. A. scalpel B. razor blade C. sword D. knife 2. He is always busy. He has ______________ time to relax. A. much B. a little C. little D. few 3. She’s running slowly through the park. She’s ______________. A. walking B. riding C. jogging D. driving 4. How do you say this fraction 3/5 in English? A. three over fifth B. three-fifth C. three-fifths D. three-fives 5. Peter’s parents are very ______________ with his success. A. please B. pleasant C. pleasing D. pleased 6. He is interested in ______________ research. A. working B. making C. studying D. doing 7. Every student ______________ to finish this test in 45 minutes. Are you all ready? A. having B. has C. had D. have 8. He couldn’t go on a long holiday as he had ______________ days off. A. a lot of B. a little C. a few D. few 9. My sister is a ______________ student. She’s never late ______________ class. A. serious/for B. hard/in C. busy/ for D. studious/with 10. They work ______________ at the hotel. A. full-time B. part-timed C. full-timed D. whole-time