một người đi xe đạp từ tỉnh A đến tỉnh B cách nhau 50 km.Sau đó 1h30'p một người đi xe máy cũng từ A đến B sớm hơn 1h.Tính vận tốc mỗi xe biết vận tốc xe máy gấp 2,5 lần vận tốc xe đạp

Có bao nhiêu số tự nhiên có ba chữ số sao cho luôn có mặt đúng một chữ số 55

Một ô-tô chuyển động từ A đến B, trong nửa phần đầu đoạn đường AB xe đi với vận tốc 120 km/h. Trong nửa đoạn đường còn lại ô-tô chia thành hai giai đoạn: Giai đoạn 1 đi nửa thời gian. đầu với vận tốc 80 km/h và nửa thời gian sau 40 km/h. Tính Vận tốc của ô tô trên cả quãng đường AB.

cali cho mik: ALAN WALKER. NL:I LOVE ALAN WALKER VERY MUCH

Dzạ cầng gất gấp luông :)) . Trước 3h20 có đc hem

cho a,b,cthoa man a^2+b^2 +c^2>=3/4

Trong muối ngậm nước Na2CO3.xH2O, Na2CO3 chiếm 37,07% về khối lượng, Xác định giá trị của x.

I.Change the direct sentences into indirect ones: 1. “Turn off the light,” he said to her. à He asked her …………………………… 2. “Close the door, Tom,” she said. à She told Tom ………………………… 3. “Don’t watch the movies too late,” I said to Mary. à I told Marry ………………………………… 4. “Buy a new car,” I advised him. à I told him ………………… 5. “Don’t lend her anything,” he advised us. à He told us ………………………………… 6. “Don’t make too much noise, children,” he said. à He told the children……………… 7. “Please help Nam to study well in English.” The teacher said to Nga.The teacher told Nga ……………………… 8. “wait for me outside the class, please.”Lan said to Minh. à Lan told Minh ………………………… 9. “Don’t touch it!” He told the child. à He told the child … 10. His wife said, “Write to me as often as you can.” à His wife told him …………………………… 11.She said, “Don’t go near the water, children.” à She told the children………………………… 12. “Could you help me, please?” he said to her. à He asked her ………………………………… 13. “Will you be here tomorrow?” she asked. à She asked him …………………… 14. “Will you read this carefully?” he said to me. à He asked me ………………………………… 15 “Could you meet me next week?” Tim asked me. à Tim asked me ………………………… 16 “ Can you give me some small money, mom ?”.Minh asked his mom …………………

Câu 1: Cho tam giác ABC vuông tại A có AB 9 cm,BC 15 cm.AH = = là đường cao (H thuộc cạnh BC ). Tính BH,CH,AC và AH.

IV .Put the verbs in the correct verb: 1. Hoa (have) __________lot of friends in Hue. 2. She (be) _____________unhappy now. She (miss) ______________ her parents in Hue. 3. Hoa (talk)_______________to Ms. Lien at the moment. 4. She (be) ______________14 on her next birthday. 5. Hoa’s old school (be)___________ small. It (not have)__________________many students. 6. I (walk) ___________to school every day, but today I (ride)_______________my bike to school. 7. We (not, go)_________________ to class on Sunday. 8. My best friend (come)________________here soon. 9. (you, be)_____________________ free next Sunday? – No. I (do) _____________my homework. 10. Phong (be) _____________on the phone now. He (talk) ________________to Tam. 11. Listen! Jane (play)_________________the piano. 12. I’d like (visit)____________________Japan some day. 13. We (visit) _____________Huong Pagoda next week. 14. I (come)_______________back tomorrow. 15. Mike (not, come) ______________to our party tonight. 16. Lan (invite)________________ her friends to her next bithday party on Sunday.. 17. Jim (often, watch) _____________television at night. 18. Who (Miss Hoa, talk)______________________to in the school yard at the moment? 19. Would you like (see) ______________ a movie? 20. Her class (have)______________forty students. 21. Lan (not, be)____________in her room at the moment. She (work) _____________in the garden. 22. They (not, go) ______________camping next week. They (visit)________________the museum. 23. This (be) ________my sister. She (be)__________________25 on her next birthday.