Câu 8:Trong mặt phẳng tọa độ Oxy, cho đường thẳng (d):y=(m-2)x+2m+1 và điểm A(1;2). Kẻ AH vuông góc với (d) .Gọi m₀ là giá trị của m để độ dài AH lớn nhất. Khi đó kết luận nào sau đây đúng?

A.-30<m₀<-10 
B.m_0<-30
C.-10<m₀<22
D.m₀>22

Elephant racing festival, one of the biggest festivals in Tay Nguyen, is held annually in the third lunar month. As preparation for the festival, villagers feed their elephants with a wide range of food apart from grass, including corns, sugar canes, sweet potatoes, papayas, and bananas. Also, in order to preserve their strength, the elephants take a rest from hard work. On the day of the event, elephants from several villages gather at Don village. Ten elephants will run at the same time for about one or two kilometers. The first elephant which reaches the destination will receive a wreath as a symbol of victory, and it will enjoy the achievement excitedly with sugar canes and bananas from surrounding people. After finishing the race at Don village, the elephants move to Serepok River for another competition-swimming. They also participate in games like football and tug of war At the end of the festive day, all festival goers mass at Don Village's community house for feasting, drinking stem wine, and in a joyful atmosphere with the boisterous sound of gongs and drums.


41. What is the main idea of the passage?

A. Preparations for the elephant racing festival

B. Elephant racing festival in Tay Nguyen

C. Elephant swimming racing in Tay Nguyen

D. Games at elephant racing festival

42. The word “annually” in the first paragraph is closest in meaning to ______. A. excitingly B. every year C. every two years D. nearly

43. Before the racing day,______.

A. elephants have to work hard

B. elephants are fed with different kinds of food

C. elephants gather at Don village

D. elephants eat and sleep a lot

44. What does the winning elephant receive as a symbol of victory?

A. sugar canes B. grass C. a wreath D. bananas 

45. It can be inferred from the passage that ______.

A. Elephant racing is the most exciting festival in Tay Nguyen

B. Elephants like playing football and tug of war

C. Gongs and drums are important musical instruments in Tay Nguyen

D. There are other big festivals in Tay Nguyen

Halloween nights used to be ______ to me with all the people in ghost and monster costumes. A. frighten B. fright C. frightening D. frightened

I think everyone ______ be responsible for the protection of the environment.

Cho tam giác ABC, có BAC=105^o.ACB=45^ovà AC=10. Tính đọ dài cạnh AB

A.\(\dfrac{5\sqrt{6}}{2}\)
B.10\(\sqrt{2}\)
C.5\(\sqrt{2}\)
D.5\(\sqrt{6}\)

Cho a;b;c là đọ dài ba cạnh của △ABC. Biết b=7;c=5;cosA=\(\dfrac{4}{5}\).Tính độ dài của a
A.3\(\sqrt{2}\)

B.\(\dfrac{7\sqrt{2}}{2}\)

C.\(\dfrac{23}{8}\)

D.6

cho tam giác abc thỏa mãn b^2+c^2-a^2=0 khi đó góc a bằng
A.90^o      B.60^o      C.120^o               D.30^o

tìm lỗi sai và sửa the man who gave a considerate amount of his money to the poor is so kind-hearted