Tính độ rượu trong các trường hợp sau: a/ Pha 200g rượu etilic vào 750 ml nước ?( biết D rượu etilic = 0,8g/ml, D=m: V) b/ Pha thêm 500ml nước vào 2lit rượu 250 ?

Cho hình thang ABCD (AB//CD) hai đường chéo AC,BD cắt nhau tại O. a) CMR: OA.OD=OB.OC b) Qua O vẽ đường thẳng song song với hai đáy cắt cạnh bên AD,BC lần lượt tại M,N CMR: OM=ON, 2/MN=1/AB+1/CD

Mọi người xin cho em hỏi câu này với ạ

1. She wishes her father (be) …………………. here now to help her. 2. I wish they (visit) ………………..……….us when they were in town. 3. They wish they (come) …………………….to class on time yesterday morning. 4. I wish I (spend) ……………..…….my last summer vacation in the mountains. 5. I wish I (see) …………………….that film on TV again. 6. We wish she (be) ……………….our teacher of English. 7. My brother wishes he (not waste) ……….…………. time when he was young. 8. I wish someone (give) …………….………. me a job next month. 9. If only I (take) ………………………..the trip to Hanoi with her next summer. 10. I wish they (know) ……………………….the truth yesterday. Task 2: Write sentences beginning with “wish”. 1. I can't go to the party. -> I _________________________________________________ 2. He doesn't have a computer. -> He _______________________________________________ 3. I don't know Ha's phone number. -> I _________________________________________________ 4. The weather is very cold. -> We _______________________________________________ 5. There are many people here. -> I _________________________________________________ 6. I live in a big city and I don't like it. -> I _________________________________________________ 7. Mr.Huy isn't here. She needs to see him. -> She ______________________________________________ 8. He has to work tomorrow. -> He _______________________________________________ 9. I don't have any thing to eat. -> I _________________________________________________ 10. We can't live together forever! -> We _______________________________________________

Các bạn giúp mk vs. Cảm ơn nhìu. Bài 5.Cho parabol (P): y = 1/2x^2 và đường thẳng (d): y = 3mx – 1 – m. a) Chứng minh đường thẳng (d) luôn đi qua một điểm cố định. b) Tìm m để đường thẳng (d) tiếp xúc với (P).

Một quả bóng khối lượng 500g rơi từ độ cao 20 m xuống mặt đất. Chọn mốc thế năng tại mặt đất, chiều dương hướng lên. Bỏ qua sức cản không khí, lấy g = 10 m/s2. a) Tính cơ năng của vật. b) Tính vận tốc của quả bóng tại nơi có động năng bằng 3 lần thế năng. c) Tính độ cao của vật khi có vận tốc 5 m/s.

Tôi cần gấpp, cần giúp. C.on 5sao cho ai đung

Bài tập so sánh 1. Mary is the……….in her class A:tall B: tallest C:taller D: the taller 2. In Viet Nam, it is normally……………. in the South than in the North. A hot B. hotter C. hottest D. hoter 3. The food is …………… than the last time I ate it. A. badder B. bad C. worse D. worst 4. Ho Chi Minh city is ………….. than Hanoi. A. big B. bigger C. biggest D. biger 5. Jack is now …………….. than he used to be. A. happy B. happier C. happiest D. happyer 6. The tourist company was ………….. down the street than I had thought A. farther B. far C. farer D. farest 7. Detective books are………………… than science fiction ones. A. more interesting B. interestingly C. interstinger D. interesting 8. Lan is ………………. than her sister. A. lazy B. lazily C. lazier D. lazilier 9. He feels ……….. than last year because his study results are ………………… A. happy/ good B. happier/ gooder C. more happy/more good D. happier/better 10. He is …………. at maths than at any other subjects. A. better B. more good C. goodlier D. gooder 11. Phuong can speak English ……….. than Minh. A. more fluent B. fluently C. fluent D. more fluently 12. Cinderrella danced …………… than any other girls at the ball. A.more graceful B. gracefuler C. gracefully D. more gracefully 13. Chemistry is …………….. than physics. A. easy B. easily C. easier D. more easily 14. Rabbits run……………… than tortoises. A. fast B. fastly C. fastlier D. faster 15. She can pronounce English words …………. than she could last term. A. correctlier B . more correct C. more correctly D. correcter 16. The country is ………….. than the city. A. quieter B . more quiet C. more quietly D. quietlier 17. In this class , the students are talking …………… than the teacher. A. loudly B. more loud C. loudlier D. louder. 18. She is the most …………….. girl in our class. A. intelligent B. intelligentest C. tall D. tallest 19. That T­shirt is the …………… we have in stock. A. big B.bigger C. small D. smallest 20. This hat is the ……………… of all. A. expensivest B. more expensive C. cheapest D. cheaper 21. Food becomes ………….. during the time of the flood. A. more scarcer B. most scarce C. scarcest D. scarce 22. Lan is the most ……………. student in my class. A. hard­work B. hard­working C. good D. best 23. This book is the ………………… of all A. bored B.boring C. more boring D. most boring 24. She has ……….. books than I do. A least B. fewer C. more few D. fewest 25. He finished the test …………..of all. A. rapidly B. the most rapidly C. most rapidly D. more rapidly 26. Many chemicals react ……………..in acid solutions A . more quick B. more quickly C. quicklier D. as quickly more

Giúp em với ạ... Bài 1: drought flood hurricane landslide tornado 1.When there is a ___________, a lot of water covers an area where there usually isn’t water. 2.A ___________ refers to a long time without rain. 3.When there is a ______________, a lot of rocks and earth fall down a hill. 4.A____________ is a storm with a lot of wind that moves over water. Bài 2: bury evacuate rage take recover scatter provide suffer 1.The government _____________ health and other services to the affected regions. 2.Action were _____________ to limit the effects of the floods in Quang Ninh. 3.The Red Cross helped homeless families to ____________ from the disaster through the project. 4.The majority of concerned areas have ___________ from cholera epidemics after the floods and landslides in Central America. 5.Early September, mudslides caused by heavy rains _____________ an entire village of 480 inhabitants. 6.Thousands of villagers ____________ from flood-prone areas after the warnings from the weather bureau. 7.Tiny particles of dust, smoke, salt or pollution droplets that ___________ through the air to cause haze. 8.The fires ____________ for more than a week in the southern region of Chile, which has been hit by a severe drought.

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