a. Chữ số 3 trong số thập phân 86,342 thuộc hàng nào? A. Hàng chục B. Hàng phần mười C. Hàng phần trăm D. Hàng phần nghìn b. Hỗn số 4 và 8/9 viết dưới dạng phân số là: A. 12/9 B.32/9 C. 41/9 D. 44/9 c. 3% của 6m là: A. 2m B. 18mm C. 18cm D. 18m d. 60% = ? A. 6,0 B. 0,60 C. 60,0 D. 0,06 e. Thể tích của hình lập phương cạnh 3m là: A. 36m2 B. 27m C. 27m3 D. 27m2 g. Khoảng thời gian từ 3 phút 12 giây đến 3 phút 46 giây là: A. 35 Giây B. 34 Giây C. 44 Giây D. 40 Giây h. 6 ha 7 dam2 = ……… ha. Số thích hợp để điền vào chỗ chấm là số nào? A. 6,7 B. 6,007 C. 67 D. 6,0 giúp mik với ạ. Xin cảm ơn.

3. a) Khi đốt cháy 10kg củi khô thì tỏa ra lượng nhiệt là bao nhiêu? b) Đế có được lượng nhiệt như vậy thì cần phải đốt cháy bao nhiều kg than đá. Biết năng suất tỏa nhiệt của củi khô và than đá là 10'J/kg và 27.10 mũ 6 J/kg.

30đ giải hộ ạ Cho hình bình hành ABCD có AC = 2AD và góc DAC = 2BAC. Hãy CMR ABCD là hình chữ nhật

Để có một lượng nhiệt là 77.10ʻJ thì cần đốt cháy bao nhiêu kg than bùn? Biết năng suất tỏa nhiệt của than bùn là 14.10°J/kg.

Tìm n thuộc N sao cho n.(n+1)(n+2)^2=60. N^3+20n +6

Ex1: Mark A,B,C,D to indicate the sentence that is closest in meaning to each of the following sentences (giúp mình vs tại mình cần gấp, cảm ơn mng trc ạ) 1: She saw that he was so angry. So she left the classroom A: She didn’t want to make him angry, so she left the classroom B: She left the classroom when she saw he was so angry C: He was very angry when he saw her leaving the classroom D: Having been seen to be angry, she left the classroom 2: The thick fog made it impossible for the plane to land A. The plane could land as the fog was hardly thick B. The plane cannot land because the fog is thick C. It was possible for the plane to land although the fog was thick D. The plane was unable to land because of the thick fog 3.Duong is writing to a newspaper in England. He wants to find a pen friend A. Duong is writing to a newspaper in England in order to find a pen friend B. So as to find his friend in England, Duong has to write to a newspaper there C. Duong wants to find a pen friend, although he is writing to a newspaper in England D. Duong is writing to a newspaper in England and then he finds a pen friend 4.The Covid-19 pandemic made it impossible for us to start our school year A. In spite of the Covid-19 pandemic, we were able to start our new school year B. We couldn't start our new school year because of the Covid-19 pandemic C. We could start our new school year because the Covid-19 pandemic happened D. The Covid-19 pandemic didn't prevent us from starting our new school year 5.Mr Thuan was injured. He managed to finish the race A. Mr Thuan was injured although he managed to finish the race B. Mr Thuan managed to finish the race despite he was injured C. Although being injured, Mr Thuan managed to finish the race D. Despite being injured Mr Thuan managed to finish the race 6.Minh doesn't read many English books because she doesn't have time A. She doesn't have time so Minh doesn't read many English books B. Because of not having time Minh doesn't read many English books C. Minh doesn't read many English books so she doesn't have time D. Because Minh doesn't have time so she doesn't read many English books

giúp mik vs nha mik đang cần gấp

Giups vs ạ, hứa vote 5 sao VI. Writing :Do as directed in brackets. 1. Nam works more responsibly than his brother. (Rewrite the sentence, using “less”) _______________________________________________________________ 2. The cultural heritage of the ethnic peoples in Viet Nam is very rich. (Make the question for the underlined words) _______________________________________________________________ 3.A lion runs faster than a horse. A horse runs ______________________________________________________ 4. many teenagers/ addicted/ the Internet/ computer games. (Make sentence) …………………… _______________________________________________ 5.. she/ get/ hooked/ the medical drama/ after/ watch/ the first episode. .6.Nam studies English the best in my class. (Rewrite the sentence) -> Nam ______________________________

cho hình bình hành ABCD có góc B = 120 độ, AB = 10cm, AD = 15cm tia phân giác góc A cắt BC tại E 1/ tính EC 2/ kẻ BH vuông góc với AE tại H. Tính BH 3/ tính diện tích ABE

F(x) = x + 3 có nghiệm là bao nhiêu