Muốn bẩy một vật nặng 2000N bằng một lực 500N thì phải dùng đòn bẩy có: A. O2O = O1O B. O2O > 4O1O C. O1O > 4O2O . D. 4O1O > O2O > 2O1O .

8 km 62m =.....km 5 giờ 15 phút =..........giờ 2018 dm vuông = ..... m ² 2 tấn 567 kg =..... kg 9 tấn 5 tạ =.......... kg 3542 dm ²=......................m ²

Nung nóng 12.25 g Kali Clorat( KClO3) có xúc tác với MnO2 thu được "a" lít khí Oxi a) Viết PTHH b) Tìm a( lít) c) Dùng lượng Oxi trên đốt cháy 5.6 g sắt . Sau khi phản ứng kết thúc , chất nào còn dư và dư bao nhiêu GIÚP MÌNH VỚI PLEASEEEE HỨA 5 SAO VOTE Ạ

Giúp em giải thích sao chọn nhưng đáp án trong bài với ạ em dg cần gấp mọi ng giúp em với ạ

pla-ton va a-ri-xtot linh vuc nghien cuu la j

II. Find one odd word A, B, C or D. 1. A. train B. plane C. plant D. car 2. A. left B. right C. straight D. square 3. A. green B. red C. orange D. light 4. A. drive B. write C. ride D. fly 5. A. fast B. rapid C. slow D. Quick III. Put questions for the underlined parts in the following sentences, using question words in brackets. 1. Nam usually goes to school by bus. Sometimes, he rides his bicycle. (How) 2. My grandfather used to go fishing in the West Lake every afternoon. (What) 3. There are a lot of trucks and cars on the highway in the rush hour. (Where) 4. The students used to be taught about road signs when they studied in secondary school. (What) 5. Hung always drives his car very carefully. (How) 6. It is about 100 km from Ha Noi to Hai Phong. (How long)

tìm đo dài các canh cua mot tam giac biet chu vi cua tam giac do bang 30 cm va ba canh cua no lân lươn ti lê vơi các sô 4 ,5 ,6

7.It’s essential to ask someone to __________ you when you visit the central part of Vietnam. A. lead B. take C. guide D. bring 8.When the tourist __________ comes, this place is full of people. A. season B. phase C. period D. stage 9.When Minh __________ the destination, he will need picking up at the airport. A. arrives B. reaches C. gets D. achieves 10.The guest __________ a hotel in advance and paid for the room and service. A. booked B. kept C. put D. bought 11. We thought about taking a ten-day __________ in the Caribbean. A. flight B. travel C. cruise D. voyage 12. On our holiday in Ha Long bay, we are __________ in a quite luxurious hotel. A. living B. existing C. remaining D. staying 13.____________ that the temple was built on the current site of Thien Tru in the 15th century A. It is think B. They thought C. It was thought D. It is thought 14.This is ________ the most difficult job I’ve ever had to do. A. by chance B. by heart C. by far D. by myself 15.Peter is a good teacher who taught me______ Maths and _____Physics at secondary school. A. Ø/Ø B. the/a C. the/the D. a/the 16.It is essential that she ________ her English for the course she is going to do at Queensland University of Technology. A. improves B. improved C. improving D. improve 17.Does it take ________ long time to get to ________ city centre? A. Ø - the B. a - a C. the - the D. a - the 18. One plastic bottle recycled saves enough energy to run a 60-watt light ________ for 6 hours. A. bulb B. standard C. electricity D. bill 19.My sister _________in the bank for five years before she was sent to Da Nang. A. has worked B. was working C. had worked D. works 20. My grandfather is the ______ oldest artisan in the village. Ngoc’s grandfather is the oldest. A. first B. second C. most D. one

nghiệm tổng quát của của phương trình 4x + y - 5

giúp mình bài 2 nha hứa vote đủ 5 sao nha