1. The villagers are trying to learn English in order to communicate with foreign customers.

2. After ate lunch, we went to Non Nuoc....

3. Even though this hand-embroidered picture was expensive, we (still) bought it.

4. This department store is an attraction in my city becase the products are of good quality.

5. This is called a Chuong conical hat since it was made in Chuong village.

30. This part of the city didn't use to have traffic jam.

31. This is his first role. Nevertheless, his acting is very excellent.

32. Despite many buses in the city, very few people actually use them.

33. How far is it from Hanoi to HCM City?

34. Minh, one of our neighbours, is very kind.

\(25,B\\ 26,C\\ 27,B\\ 28,C\\ 29,B\)

\(12,D\\ 13,C\\ 14,B\\ 15,A\\ 16,C\\ 17,D\)

21. When did you start riding a bicycle?

22. When did he write to you?

23. How long is it since he last talked to you?

24. How long is it since you last telephoned him?

25. It's the first time we have eaten this kind of food.

26. Because of Hoa's richness, she could buy that house.

27. Since the price is cheap, my wife insists on buying the TV.

28. In spite of the heavy rain, we still went to school.

29. Despite being the boss, Trang works as hard as her employees.

30. Although he has health problems, he is always smiling.

1. They run out of the door screaming.

2. Spiders welcomed in Ukraine around the Chrismast season.

3. Because they allegedly bring good luck.

4. To usher in good luck and fortune for the coming year.

5. No, it isn't. (This sounds more like a trick being played on the citizens of Ukraine by the companies that make fake spiderwebs)

Trong ngoặc là dẫn chứng th nha

\(a,\) Khi \(x=10\) và \(y=3\), \(A=3\cdot10-5\cdot3+5=30-15+5=20\)

\(b,\) Khi \(x=5\) và \(y=6\), \(B=4\cdot\left(5+6\right)-2\cdot5-6=4\cdot11-10-6=44-10-6=28\)

\(a,35+41+65=\left(35+65\right)+41=100+41=141\\ b,24+37+76+73=\left(24+76\right)+\left(37+73\right)=100+110=210\\ c,27\cdot45+27\cdot55=27\cdot\left(45+55\right)=27\cdot100=2700\\ d,2\cdot3\cdot5\cdot7=\left(2\cdot5\right)\cdot\left(3\cdot7\right)=10\cdot21=210\\ e,4\cdot11\cdot25\cdot9=\left(4\cdot25\right)\cdot\left(11\cdot9\right)=100\cdot99=9900\)

\(a,2x-10=12\\ \Rightarrow x=\dfrac{22+10}{2}=11\)

\(b,18-3x=6\\ \Rightarrow x=\dfrac{6-18}{-3}=4\)

\(c,20:x+4=9\\ \Rightarrow20:x=5\\ \Rightarrow x=20:5=4\)

\(d,x:5-7=12\\ \Rightarrow x:5=19\\ \Rightarrow x=\dfrac{19}{5}\)

\(e,\left(28-x\right):4+12=17\\ \Rightarrow\left(28-x\right):4=5\\ \Rightarrow28-x=20\\ \Rightarrow x=8\)

\(f,2x+4x=30\\ \Rightarrow6x=30\Rightarrow x=5\)

\(g,x+4x=40\\ \Rightarrow5x=40\Rightarrow x=8\)

\(h,2\left(x+4\right)-18=30\\ \Rightarrow2\left(x+4\right)=48\\ \Rightarrow x+4=24\\ \Rightarrow x=20\)

\(i,2x-4\cdot8=12:3\\ \Rightarrow2x-32=4\\ \Rightarrow2x=36\\ \Rightarrow x=18\)

\(a,\) Khi \(x=4\) và \(y=9\), \(A=2\cdot4+9:3=8+3=11\)

\(b,\) Khi \(x=1\) và \(y=8\), \(B=\left(1+8\right)\cdot5-2\cdot1-8=9\cdot5-2-8=45-10=35\)

\(c,\) Khi \(x=6\) và \(y=5\), \(C=6\cdot\left(6+5\right)-5\cdot\left(5-4\right)=6\cdot11-5=66-5=61\)