Bài 2: a) Cho MN và PQ tỉ lệ với 3; 4 và PQ = 12cm. Tính độ dài của MN ? b) Cho biết AB và CD tỉ lệ với 5; 4 và CD = 20cm. Tính độ dài đoạn AB ?

Các câu hỏi liên quan

Complete the sentences with the correct prepositions. 1. After school we usually hang ______________ the shopping centre. a) about b) around c) over d) into 2. I bumped _____________ Sarah yesterday and almost didn’t recognize her. a) in b) on c) into d) across 3. I was walking past Ted’s house and I decided to drop __________________. a) in b) into c) out d) on 4. I’m calling the police! I can’t put __________ with that noise any longer! a) on b) out c) down d) up 5. If this volcano erupts, the sulphuric acid is going to kill _______ all the animals living in this region a) out b) away c) off d) on 6. The fire is extremely difficult to put __________ because of high winds. a) up b) out c) off d) down 7. It makes me wonder how I’ve managed to put ______________ weight so quickly. a) away b) up c) on d) over 8. Working _____________ in a gym isn’t for John. He prefers spending time outdoors. a) out b) up c) over d) about 9. I’ve already given ______________ playing strategy games. a) away b) off c) up d) down 10. Ted Mason is so relax. The most laid - __________ person I know. a) out b) back c) down d) over 11. I could use some help with setting ______ a blog. Do you think you could give me a hand? a) in b) out c) up d) on 12. Sam, could you turn _____________ that music? I’m on the phone and can’t hear a thing! a) on b) up c) in d) down 13. Only one ____________ four people enjoy flying. a) in b) from c) out d) on 14. We honestly think you should cut ______ on spending so much time in front of the computer. a) over b) off c) down d) out 15. Who’s going to sort _________ the leaflets before our environmental campaign? a) away b) out c) up d) down 16. The tsunami wave is heading ___________ the Indonesian coast! a) for b) away c) over d) to 17. I always try to keep _______________ to date with the latest technology. It’s my hobby. a) on b) up c) in d) by 18. I was really ashamed when my mobile phone went ____________ in the middle of the meeting. a) away b) out c) up d) off