Cho tam giác ABC . Vẽ về phía ngoài tam giác ABC , các tam giác vuông tại A là ABD, ACE có AB = AD , AC = AE. Kẻ AH vuông với BC, DM vuông góc với AH, EN vuông góc với AH. chứng minh rằng : a) DM = AH b, EN = AH . Có nhận xét gì về DM và EN c,Gọi O là giao điểm của AN và DE.Chứng minh rằng O là trung điểm của DE

Trong bài Con cò nhà thơ Chế Lan Viên có viết Con dù lớn vẫn là con của mẹ Đi hết đời lòng mẹ vẫn theo con Hai dòng thơ trên đã giúp em cảm nhận được gì đẹp đẽ sâu sắc ? Các bạn làm nhanh giúp mình nhé mình cần gấp , mình cảm ơn

1. Scientists say that exhaust fumes are _____ our city. (poison) 2. Many seabirds were ___ because of the poison spill. (die)

Vẽ pikachu hoặc là Ice bear của We Bare Bears! Nếu thích đăng cả 2. :Đ Có tô màu!

I, Chọn A,B,C or D 1. My parents ............ me to see Ho Chi Minh's Mausoleum last summer A . Led B. took C.brought D. directed 2. I'm sure they were .......... Lies. A. tellinh B. making C.doing D. saying 3. My sister will be 16......Sunday........... A.on - May 25th B, on - May 25 C. in-25th May D. in-May 25 4. IF he eats all that food , he eats ............. A. quite much B. too many C. quite many D. too much 5. Mr Robinson speaks VietNamese very ............... A. Skillfully B. good C. Fluently D. best 6. The dress Hoa made didn't ............... her ; it was too small A. match B.Suit C. go with D.Fit 7. Don't forget ............ your teeth before going to bed A. brushing B. to brush C. not to brush D> about brushing 8. Hoa tried ............ that new dress but it didn't fit A. out B. at c. with D.on 9. THe fist things many people do when they want ............ weight is dramatically cut their calories A. to gain B. to lose C> to out D. to decrease 10. My Dad has a .............. summer vacation. A. three - weeks B. three - week's C. three weeks D. three - week Giup nhanh nha - nhớ chuẩn xác nhé ( cần chuyên gia)

1 mol \(\begin{cases}CO_2\\ H_2O\end{cases} + \xrightarrow{+C}\) 1,5 mol \(\begin{cases}CO_2\\ CO\\ H_2\end{cases}\)/ Dẫn toàn bộ Y từ từ qua m1 gam hh Fe2O3, Fe3O4, CuO -> m2 gam rắn. TÍnh m1 - m2

Theo mọi người nghĩ,thì khi đi lên cầu thang,chúng ta đi 1 bậc,hay 2 bậc thì nhanh hơn.Vì sao

Mọi người giải nhanh giúp mình nha! Mình sẽ vote 5 sao! Cho m (g) Fe + 450g dung dịch HCl vừa đủ ⇒ dung dịch A + 6.72 lít khí. Tính C% (HCl) và C% dung dịch A.

PASSIVE VOICE – SIMPLE FUTURE AND MODALS 1. The old lady will beat the dog. ............................................................................................................................... 2. They will sing a song on Christmas Eve. ............................................................................................................................... 3. The man will give the woman a bunch of beautiful flowers. ............................................................................................................................... 4. Dad will help me do the homework. ............................................................................................................ 5. Grandpa will read the papers tonight. ............................................................................................................. 6. The boy will watch the cartoon on TV this evening. ............................................................................................................................... 7. Tom will do his homework tomorrow. ........................................................................................................... 8. Nick can answer the teacher’s question. ............................................................................................................. 9. We must keep the world clean. ............................................................................................................................... 10.Mom will empty the garbage at five o’clock. ............................................................................................................................... 11. She will use the computer. ............................................................................................................................

PASSIVE VOICE – MODAL VERBS 1. You must take off your shoes. . ................................................................................................................................ 2. He shouldn’t smoke cigarettes in this room. . ................................................................................................................................ 3. We could see Tom in the crowd. . ................................................................................................................................ 4. Eddie might help you if you ask him. . ................................................................................................................................ 5. We can order some lemonade at the bar. . ................................................................................................................................ 6. We have to protect our sea. . ................................................................................................................................ 7. They ought to park the car in the right place. . ................................................................................................................................ 8. You should speak English in class. . ................................................................................................................................ 9. Mary used to keep a dog. . ................................................................................................................................ 10. People would buy tickets at this booth. . ................................................................................................................................ 11. They can book rooms in advance. . ................................................................................................................................ 12. We may borrow his car for a day. . ................................................................................................................................