BT: q1=4.10-8C, q2= - 3.10-8 C, q3 = 10-8C, AB =5cm, ε=1. Xác định F tổng hợp do q1, q2, tác dụng lên q3 đặt tại các vị trí sau. a. M là trung điểm của AB. b.N là điểm thuộc AB sao cho: AN = 5cm, BN = 10 cm. c. C sao cho AC = 4 cm, BC = 3cm

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8. What ____________ we ____________ (prepare) for dinner? 9. Where ____________ you ____________ (go) for your vacation?

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b1:thực hiện phép tính a, √20- √45+3 √18+ √72 lm hộ vs

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Read the following passage and choose the option (A, B, C or B) that best answers each of the questions below. With the habit of working in teams and being helpful to one other, villagers usually earn their living from farming, raising livestock and making handicrafts. They live in a small community with a temple or a communal cultural house where great events, such as festivals worshipping the village god and traditional games are organized. Villagers in the Southern usually live in houses lined up along central road and built on stilts to keep above flood waters. Along the coastal lines, fishermen depend on the sea as a means of livelihood. In the Central of Vietnam, a place suffering lots of natural disasters all the year round, citizens tend to be more studious and hard-working than those in regions with favourable conditions. People in the central highlands and the northern mountains live by growing rice, rubber trees coffee and tea as well as hunting. (Source: Adapted from Vietnam Travel Center) 41. Which can be the topic of the passage? A. Villagers across the country B. Villagers around the world C. Vietnamese life in the countryside D. Vietnamese life in the city 42. Which activity is NOT MENTIONED as a way for villagers to earn their livings? A. Farming B. Fishing C. Studying D. Hunting 43. Why do Southern villagers need to build their houses on stilt? A. To protect the house from being attacked by wild animals B. To protect the house from being flooded C. To protect the house from earthquakes D. To protect the house from evil things 44. Which sentence is NOT TRUE according to the passage? A. There are many disasters in the Central of Vietnam B. Houses in the Southern part of Vietnam often C. People in the Northern Mountainous earn their livings by hunting D. Villagers often work individually 45. Which explanation has the closest meaning to the word “studious” in the passage? A. spending a lot of time studying B. lacking of academic knowledge C. being lazy in studying D. being very intelligent

Cùng một lúc từ 2 địa điểm A và B cách nhau 2 ô tô chuyển động thẳng đều, xe A đuổi theo xe B với lần lượt vận tốc là 40km/h và 30km/h. a, Lập phương trình chuyển động của 2 xe? Tùy chọn gốc tọa độ, chiều dương b, Xác định khoảng cách giữa 2 xe sau 1,5 giờ và sau 3 giờ? c, Xác định vị trí gặp nhau của 2 xe d, Hai xe cách nhau 25km lúc mấy giờ? Gỉa sử xe A bắt đầu đuổi xe B là lúc 9 giờ 30 phút e, Vẽ đồ thị tọa độ, thời gian của 2 xe