b) 

a) \(\sqrt{2}x+1=7-x\Leftrightarrow\left(\sqrt{2}+1\right)x=6\Leftrightarrow x=\dfrac{6}{\sqrt{2}+1}=-6+6\sqrt{2}\)

b) \(\left\{{}\begin{matrix}2x+3y=2\\x-y=\dfrac{1}{6}\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}2x+3y=2\\3x-3y=\dfrac{1}{2}\end{matrix}\right.\Leftrightarrow}\left\{{}\begin{matrix}5x=\dfrac{5}{2}\\x-y=\dfrac{1}{6}\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=\dfrac{1}{2}\\y=x-\dfrac{1}{6}\end{matrix}\right.\Leftrightarrow}\left\{{}\begin{matrix}x=\dfrac{1}{2}\\y=\dfrac{1}{3}\end{matrix}\right.\)

There used to be servants.

People didn't use electricity.

People used to eat candies.

People didn't use to work and play games on computers.

33. They don't usually drink beer.

→ They do not get___used to drinking beer_____.

34. They say people built the school in 1990.

→ The school is_____said to have been built in 1990____.

35. The boy looks very handsome. He has just come back from Europe.

--->The boy who has just__come back from Europe looks very handsome____.

36. He cannot speak English, but he chooses to live in Australia.

--->Despite his_____unability to speak English, he chooses to live in Australia____.

25. The (volcano)__volcanic___eruption caused a lot of bad effects.

26. A (disaster)____disastrious__eruption occurred here last night.

27. They said "good bye" to each other just because of some minor (understand)__misunderstanding___.

28. The car is a complete write off. It is quite (repair)___unrepairable___.

29. He is an (experience)_____inexperienced___doctor who just graduated from the medical school last year.

30. The American boy spoke Vietnamese (nature)__unaturally____,but we all encouraged him to go on with his impressive speech.

ui xong Viet qua làm đồ thị đó à :))

B - B - B - C - B - B - D