41. find

42. have

43. playing

44. riding

45. sports

46. book

47. go

48. look

49. pair

50. expensive

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Đọc rồi trả lời câu hỏi:

Hoa is a new student in class 7A. She is from Hue and her parents still live there. She lives with her uncle and aunt in Ha Noi.

Hoa has lots of friends in Hue. But she doesn't have any friends in Ha Noi. Many things are different. Her new school is bigger than her old school. Her new school has a lot of students. Her old school doesn't have many students.

Hoa is unhappy. She misses her parents and her friends.

a) Where is Hoa from?

b) Who is she staying with?

c) Does she have a lot of friends in Ha Noi?

d) Why is Hoa unhappy?

\(S=\frac{3}{1.4}+\frac{3}{4.7}+\frac{3}{7.10}+...+\frac{3}{100.103}+\frac{1}{103.104}+\frac{1}{104.105}+\frac{1}{105.106}+\frac{1}{106+107}\)

\(S=\left(1-\frac{1}{4}+\frac{1}{4}-\frac{1}{7}+\frac{1}{7}-\frac{1}{10}+...+\frac{1}{100}-\frac{1}{103}\right)+\left(\frac{1}{103}-\frac{1}{104}+\frac{1}{104}-\frac{1}{105}+\frac{1}{105}-\frac{1}{106}\right)+\frac{1}{106+107}\)

\(S=\left(1-\frac{1}{103}\right)+\left(\frac{1}{103}-\frac{1}{106}\right)+\frac{1}{106+107}\)

\(S=\frac{102}{103}+\frac{3}{10918}+\frac{11343}{106}\)

\(S=108\)