Đáp án:
Giải thích các bước giải:
a)Ptđt có dạng: y=ax+b
cắt trục tung tại -2 => tung độ gốc =-2 <=> b=-2
ptđt: y= ax-2
tag45độ =1 => hệ số góc a =1
ptđt: y= x-2
b) Ptđt qua gốc tọa độ có dạng: y=ax
tag 60 độ = √3, => a=√3
ptđt: y=√3x
Cho tam giác ABC có góc A là góc vuông và chu vi bằng 24cm, cạnh góc vuông AB bằng 3 phần 4 cạnh góc vuông AC; cạnh BC=10cm. Tìm diện tích tam giác ABC.
Vẽ ma đi Vẽ 2 con 1 cute 2 đáng sợ Lâu lâu on 1 chút
1. My fiend Nigel, __________ works in the city, earns much more than I do. A. which B. that C. whose D. who 2. Everyone _________ the building was searched by the police A. entered B. entering C. enter D. enters 3. Love, ________ is a wonderful feeling, comes to everyone at sometime in his life A. which B. what C. where D. who 4. I have three brothers, ___________ are businessmen A. all of which B. all of whom C. all of those D. all of who 5. The chemistry book ________ was a little expensive A. I bought that B. that I bought it C. I bought D. what I bought 6. Only a few of movies ___________ on TV are suitable for children A. showing B. which show C. shown D. show 7. Thanksgiving is a time ___________ everyone eats turkey in America A. when B. at that time C. that D. A and C 8. Give me a word ________ with H. A. begins B. began C. begin D. beginning 9. I have to announce that the manager cannot attend our party today, _______ is a pity A. who B. which C. what D. that 10. Geometry is a branch of mathematics _______ the properties of lines, curves, shapes, and surfaces A. concern with B. it is concerned with C. which concern D. that is concerned with 11. Do you know any restaurant __________ we can have a good meal? A. where B. which C. that D. what 12. The artist, _________ painting you bought, is a classmate of mine A. from whose B. from whom C. whom D. Whose 13. Neil Armstrong was the first man ________ on the moon A. walking B. to walk C. walked D. walks 14. The factory in ______ Jane works is the biggest in the town A. that B. where C. when D. which 15. Two thieves _________ at a bus stop were arrested yesterday A. having waited B. waited C. waiting D. were waiting 16. Her mother, ________ has been working for twenty years, is retiring next week A. whom B. who C. whose D. that 17. Books and newspapers _________ around made his room very untidy A. that lie B. lying C. laying D. which lied 18. The Lake District, ______ was made a national park in 1951, attracts a large number of tourists every year A. where B. that C. which D. what 19. Peter, _________ I played tennis on Sunday, was fitter than me A. with that B. whom C. with whom D. which 20. I met someone _________ sister I went to school with A. whom B. who C. whose D. that 21. The only room _________ yesterday was mine A. is painted B. to be painted C. painting D. paints 22. David was the only person __________ his help A. offers B. offering C. to offer D. offered 23. He was the second man _________ in this way A. killing B. to be killed C. kills D. is killed 24. A chemical company _______ 4000 people has gone bankrupt. A. employs B. employing C. employed D. employ 25. The police never found the money ________ in the robbery A. stolen B. stole C. is stolen D. steal 26. The boy ________ in the accident was taken to the hospital A. injure B. injures C. injured D. injuring 27. The captain was the last man _______ the ship A. to leave B. leaves C. leave D. leaving 28. He just said anything __________ came into his head A. that B. what C. which D. this 29. The man _________ my mother is talking is my English teacher A. to whom B. what C. which D. where 30. The river _________ flows through Hereford is Wye A. which B. where C. that D. A and C 31. That man, _____ next to Maria, is my uncle A. sits B. sitting C. sat D. sit 32. This school is only for children ___________ first language is not English A. whose B. which C. what D. that 33. My office, ________ is on the second floor of the building, is very small A. which B. where C. that D. this 34. The vegetables __________ in supermarkets are grown without chemicals A. sold B. sells C. sell D. selling 35. Some weapons ________ at a flat in Bristol belong to the IRA A. find B. finding C. finded D. found 36. People __________ against pollution have marched to London A. protest B. protesting C. protests D. protested 37. Is there anyone _____ can help me do this? A. that B. who C. whom D. this 38. It was the nurse ____________ told me to come in A. who B. what C. that D. whom 39. We saw many soldiers and tanks __________ were moving to the front A. that B. which C. those D. what 40. The teacher ________ we studied last year no longer teaches in our school A. with whom B. with that C. with who D. with what 41. There were a lot of people ________ in a long line outside the box office A. waited B. waits C. waiting D. wait 42. I’ve met many people, some of__________ are from my country A. whom B. who C. which D. that 43. The photographs _______ in the newspaper were extraordinary A. publish B. published C. publishing D. publishes AI RẢNH GIÚP MÌNH VS Ạ!!!GẤP LẮM
a) Cho hai tia Ox và Oy là hai tia đối nhau. Tia Oz không trùng với hai tia Ox và Oy. Gọi Om, On lần lượt là hai tia phân giác của góc xOz, zOy. Chứng minh rằng Om ⊥ On b) Cho hai tia Ox, Oy đối nhau. Tia Oz không trùng với hai tia Ox, Oy. Gọi Om là tia phân giác của góc xOz. Trên nửa mặt phẳng bờ xy chứa tia Oz, vẽ tia Om ⊥ On Chứng minh rằng: On là tia phân giác của góc zOy Mọi người giúp em với, em cần gấp lắm rồi hmu hmu =((((
Khoanh và giải thik giúp mình vs
Rút gọn bt sau : P= 2(a+b)(a-b)+(a+b)^2+(a-b)^2+(a+b)^2-4b^2
chỉ được dùng thêm quỳ tím, hãy nêu phương pháp nhận biết các dung dịch bị mất nhãn sau: K2S, K2CO3, K2SO3, NaHSO4, CaCl2
Đốt cháy hoàn toàn 0,1 mol hỗn hợp X chứa 3 amin no, bậc 1 cần V lít O2 (đktc) . Biết sản phẩm cháy có 12,32 gam CO2 và 0,13 mol N2 . Giá trị của V là :
cho hai đường thẳng song song m n , đường thẳng d cắt m và n lần lượt tại A và B trong các góc tạo thành biết có 1 góc = 80 độ . tính các góc còn lại trên hình. háy giải 9 cách , cảm ơn
cho hàm số bậc nhất:y=ax+3 a)xác định hệ số a biết hệ số góc bằng -2 b)tính góc tạo bởi đường thẳng với phía dương của trục ox
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