Bài 7: Chọn câu đúng A. 4 – (a + b)2 = (2 + a + b)(2 – a + b) B. 4 – (a + b)2 = (4 + a + b)(4 – a – b) C. 4 – (a + b)2 = (2 + a – b)(2 – a + b) D. 4 – (a + b)2 = (2 + a + b)(2 – a – b) Bài 8: Rút gọn biểu thức A = (3x – 1)2 – 9x(x + 1) ta được A. -15x + 1 B. 1 C. 15x + 1 D. – 1 Bài 9: Rút gọn biểu thức B = (2a – 3)(a + 1) – (a – 4)2 – a(a + 7) ta được A. 0 B. 1 C. 19 D. – 19 Bài 10: Có bao nhiêu giá trị x thỏa mãn (2x + 1)2 – 4(x + 3)2 = 0 A. 0 B. 1 C. 2 D. 3 Bài 11: Tìm x biết (x – 6)(x + 6) – (x + 3)2 = 9 A. x = -9 B. x = 9 C. x = 1 D. x = -6 Bài 12: Tìm x biết (3x – 1)2 + 2(x + 3)2 + 11(1 + x)(1 – x) = 6 A. x = -4 B. x = 4 C. x = -1 D. x = -2 Bài 13: So sánh M = 232 và N = (2 + 1)(22 + 1)(24 + 1)(28 + 1)(216 + 1) A. M > N B. M < N C. M = N D. M = N – 1 Bài 14: Chọn câu đúng về giá trị các biểu thức sau mà không tính cụ thể A = 1 + 15(42 + 1)(44 + 1)(48 + 1) và B = (43)5 + (45)3 A. A = B + 2 B. B = 2A C. A = 2B D. A = B Bài 15: Phân tích đa thức mx + my + m thành nhân tử ta được A. m(x + y + 1) B. m(x + y + m) C. m(x + y) D. m(x + y – 1) Bài 16: Đẳng thức nào sau đây là đúng A. y5 – y4 = y4(y – 1) B. y5 – y4 = y3(y2 – 1) C. y5 – y4 = y5(1 – y) D. y5 – y4 = y4(y + 1) Bai 17: Đẳng thức nào sau đây là đúng A. 4x3y2 – 8x2y3 = 4x2y(xy – 2y2) B. 4x3y2 – 8x2y3 = 4x2y2(x – y) C. 4x3y2 – 8x2y3 = 4x2y2(x – 2y) D. 4x3y2 – 8x2y3 = 4x2y2(x – 2y) Bài 18: Chọn câu sai. A. (x – 2)2 – (2 – x)3 = (x – 2)2(x – 1) B. (x – 2)2 – (2 – x) = (x – 2)(x – 1) C. (x – 2)3 – (2 – x)2 = (x – 2)2(3 – x) D. (x – 2)2 + x – 2 = (x – 2)(x – 1) Bài 19: Phân tíc đa thức 3x(x – 3y) + 9y(3y – x) thành nhân tử ta được A. 3(x – 3y)2 B. (x – 3y)(3x + 9y) C. (x – 3y) + (3 – 9y) D. (x – 3y) + (3x – 9y) Bài 11: Tìm nhân tử chung của biểu thức 5x2(5 – 2x) + 4x – 10 có thể là A. 5 – 2x B. 5 + 2x C. 4x – 10 D. 4x + 10

Gúp mik câu 3 này nha các bạn

MakE questions for underlined words 1/ Sue goes to work at 7.30 every day. ……………………………………………………………………………………………? 2/ I wrote a letter to a friend last week. ……………………………………………………………………………………………? 3/ He usually drinks a cup of coffee in the morning. ……………………………………………………………………………………………? 4/ I stayed in their house for 3 days. ……………………………………………………………………………………………? 5/ I was born in HCM City. ……………………………………………………………………………………………? 6/ He met Lan at the zoo two days ago. ……………………………………………………………………………………………? 7/ I bought three pencils yesterday. ………………………………………………….………………………………………? 8/ My father gave me this bike. …………………………………………..………………………………………………? 9/ I went to Hanoi two weeks ago. ……………………………………………………………………………………………? 10/ Sue often gets up at six o’clock. ………………………………………………………………………….…………………? 11/ Mai went to the party with her friends. …………………………………………………………………………………….………? 12/ Mr Pike works in an office in London. ……………………………………………………………………………………………? 13/ My father is a driver. …………………………………………………………………………………….………? 14/ Nam usually goes to school by bike. ……………………………………………………………………………….……………? 15/ Peter lost a car last week. ……………………………………………………………………………………………? 16/ I phoned Lan two weeks ago. ………………………………………………………..………………………………………? 17/ Mr Pike works in a factory. ……………………………………………………………..…………………………………? 18/ She often goes to school at 6.40 a.m . ……………………………………………………………..…………………………………? 19/ We stayed in Paris for 3 months. ……………………………………………………………..…………………………………? 20/ My sister has a lot of books. ……………………………………………………………..…………………………………? 21/ Lam is repairing his bike now. ……………………………………………………………..…………………………………?

1.Keep on ……………………………… (do) whatever you were doing. 2.Ann borrowed Sally’s clothes without ……………………………… (ask) her first. 3.The children practised ……………………………… (throw) the ball. 4.I can’t help ……………………………… (worry) about her absence. 5.Last night she finished ………………………………. (study) about ten . 6.Ask him (come) ……………………………… in. Don’t keep him (wait) ...................... at the door. 7.I didn’t know how (get) ………………….to your house. Therefore, I stopped (ask) ……………the way. 8.It’s no good (write) ……………………………… to him, he never answers letters. 9.Adam is used to (sleep) ……………………………… late at weekends. 10.When I was young, I used (swim) ………………………………. every day. 11.He made me (do) ……………………………… it all over again. 12.I let him (go) ………………………… early as he wanted (meet) ……………………… his wife. 13.Scientists are trying (search) ……………………………… alternative fuels. 14.My father has refused (lend) ……………………………… me the money. 15.Jack hopes (arrive) ……………………………… next week. 16.He learned (play) ……………………………… the piano. 17.She managed (finish) ……………………………… her work early. 18.We are looking forward to (read) ……………………………… your new book. 19.I don’t feel like (work) ………………………………. What about (go) ……………………………… to a concert instead? 20.When a student asks a question, the teacher tries (explain) ……………………………… the problem as clearly as possible. 21.I rang the doorbell but there was no answer. Then I tried (knock) ……………………… on the door but there was still no answer. 22.We tried (put) …………………… the fire out but we were unsuccessful. We had to call the fire brigade. 23.You don’t need (iron) …………………… that shirt. It doesn’t need (iron) ………………………. 24.Do you want (leave) ……………………………… early? 25.She enjoys (take) ……………………………… a trip to Ha Long Bay . 26.I am not interested in (listen) ……………………………… to music. 27.I don’t feel like (go) ……………………………… to the cinema tonight. 28.She is afraid of (live) ……………………………… on her own in a big city. 29.You must try (study) ………………………… harder if you want (pass) ………………… the exams. 30. Would you mind (do) ……………………………… the housework? 31. It’s no good (tell) ………………… your father about your failure 32. (Lose) ………………… weight, I’d advise you to cut out fats from your diet. 33. It was horrible (work) ………………… as an au pair. My family expected me (work) ………………… seven days a week. 34. He was having trouble (hear) ……………………… her. 35. Six months after the accident, he still has difficulty (walk) ………………………. 36. Would you like (drink) ……………………………… a cup of tea ? 37. These children spend most of their time (watch) ………………………… TV. 38. She enjoys (collect) ………………………… stamps all over the world.

Làm lẹ giúp em ạ em cần gấp lắn

Câu D của câu 10 là 120=10.3.4 ạ

mn giải chi tiết dùm em câu này vs ạ cosx.cos2x-sinx.sin2x=1

TENSES 1.I ………………………… ( clean) my teeth three times yesterday. 2.It was hot in the room so I ………………………… (open) the window. 3.The accident ………………………… (not happen) last Sunday. It ………………………… (happen) yesterday. 4.Where ……………………………………… you (go) last summer? 5.I ………………………… (eat) an orange every day. Yesterday I ………………………… (eat) one. 6.Ann’s grandfather ………………………… (die) when he was 90 years old. 7.You ………………………… (go) to the concert last night ? 8.We usually ………………………… (go) to the cinema on Sundays . 9.You ………………………… (do) a lot of homework last night? 10.Jim came into the room, ……………………… (take) off his coat and …………………… (sit) down. 11.Why ………………………… you (be) late this morning? 12.Where ………………………… Chris and Ann (be) last week? 13.The weather ………………………… (be) nice last week? 14.I ………………………… (not watch) TV very often . 15.Martin ………………………… (not usually drive) to work . 16.A: What time ………………………… your father (finish) work in the evenings? B: He often ………………………… (finish) work at 6 . 17.Sarah is tired. She ………………………… (want) to go home now. 18.Sue ………………………… (not like coffee. She …………………………. (prefer) tea . 19.It often ………………………… (snow) here? 20.You always …………………………. (get) up early? 21.Jane ………………………… (live) in a big city? 22.My children ………………………… (not like) oranges. They ………………………… (like) apples. 23.Sandra ………………………… (speak) Spanish but she …….............. (not speak) Italian. 24.He ………………………… (catch) the bus every morning. 25.I ………………………… (play) tennis yesterday but I ………………………… (not win) 26.We ………………………… (go) to the cinema but the film ………………………… (not be) good. We ……………………… (not enjoy) it. 27.You …………………………………… (arrive) in Hanoi the day before yesterday? 28. A: What ……………………… you (do) yesterday afternoon ? B: I ……………………… (do) the housework. 29.Ted ………………………… (be) at work yesterday ? 30.Today the weather ………………………… (be) nice but yesterday it …………………………. (be) very cold. 31.This time last week, I ………………………… (be) in Paris. 32.I like your new jacket . It ………………………… (be) expensive? 33.They ………………………… (enjoy) the party last night. They ………………………… (dance) a lot and ………………………… (talk) to a lot of people. 34.I ………………………… (see) a good film last night. 35.I ………………………… (see) Mai yesterday morning but I ………………………… (not see) Lan. 36.They ………………………… (drive) to Monaco every summer. 37.She usually ………………………… (go) for a walk in the morning. 38.We ……………………………… (not have) time to visit the Eiffel Tower last week. 39.They ………………………… (not be) in Japan last year. 40.Jane …………………………………… (send) you a letter last month? 41.Where you ……………………………………… (live) ten years ago? 42.They …………………………… (be) in Iceland last January? 43.He ………………………… (play) the piano when he ………………………… (be) a child. 44.You ………………………………… (play) the piano when you were young? 45.We always ………………………… (have) roast beef on Sundays when I was a boy.

Quy trình làm và vai trò của cồn (ancol) trong nước nước rửa tay. Mấy anh chị giúp em với ạ em hết điểm rồi

tại sao vecto không có lại phương và hướng túy ý