1 she went to university so as to study engineering

2 if he had prepared for the interview, he would have got the job

3 nam is study the best in my class

4 if i had enough money, i could buy this car

5 it was not until 199 that she became a teacher

6 A new house are going to be built this month

7 when are you listen to music to relax ?

câu 7 mk ko chắc 

33. She went to universityto study engineering.

34. If he had prepared for the interview, he would have got the job.

35. Nam studies the best in my class. 

36. If i had enough money, I could buy this car.

37. It was not until 1990 that she became a teacher.

38. A new house are going to be built this month.

39. What do you often listen to music for? 

3 Chọn D

mờ quá bạn ơi

cộng cả 2 vế với -1

x=105

Ta có :\(\frac{x-5}{100}+\frac{x-4}{101}+\frac{x-3}{102}=\frac{x-100}{5}+\frac{x-101}{4}+\frac{x-102}{3}\)

<=> \(\left(\frac{x-5}{100}-1\right)+\left(\frac{x-4}{101}-1\right)+\left(\frac{x-3}{102}-1\right)=\left(\frac{x-100}{5}-1\right)+\left(\frac{x-101}{4}-1\right)+\left(\frac{x-102}{3}-1\right)\)

<=> \(\frac{x-105}{100}+\frac{x-105}{101}+\frac{x-105}{102}=\frac{x-105}{5}+\frac{x-105}{4}+\frac{x-105}{3}\)

<=> \(\left(x-105\right)\left(\frac{1}{100}+\frac{1}{101}+\frac{1}{102}\right)=\left(x-105\right)\left(\frac{1}{5}+\frac{1}{4}+\frac{1}{3}\right)\)

<=> \(\left(x-105\right)\left(\frac{1}{100}+\frac{1}{101}+\frac{1}{102}-\frac{1}{5}-\frac{1}{4}-\frac{1}{3}\right)=0\)

<=> x - 105 = 0 (Vì \(\frac{1}{100}+\frac{1}{101}+\frac{1}{102}-\frac{1}{5}-\frac{1}{4}-\frac{1}{3}\ne0\))

<=> x = 105

Vậy nghiệm phương trình là x = 105

#muon roi ma sao con

\(\frac{x-5}{100}+\frac{x-4}{101}+\frac{x-3}{102}=\frac{x-100}{5}+\frac{x-101}{4}+\frac{x-102}{3}\)

\(\Leftrightarrow\frac{x-105}{100}+\frac{x-105}{101}+\frac{x-105}{102}-\frac{x-105}{5}-\frac{x-101}{4}-\frac{x-102}{3}=0\)

( cả 2 vế trừ đi 3 và từng phân thức trừ đi 1 ) 

\(\Leftrightarrow\left(x-105\right)\left(\frac{1}{100}+\frac{1}{101}+\frac{1}{102}-\frac{1}{5}-\frac{1}{4}-\frac{1}{3}\ne0\right)=0\Leftrightarrow x=105\)

Vậy tập nghiệm của pt là S = { 105 } 

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III

1 A

2 B

3 C

4 C

5 C

6 D

7 B

8 B

9 C

10 C

11 B

12 B

13 D

14 D

15 C

16 B

17 A

18 D

19 A

20 B

21 C

IV

1 Will teacher be replaced by robots in the future?

2 Nam said he wanted to be a robot designer

3 May said she hoped she would be in a city out at the sea

4 Linda said she overslept that morning

5 Anti-ageing pills will be invented to help people live longer

6 The contaminated results in people's health

7 If the factory doesn't treat its waste well, there will be serious water pollution

8 Five houses in a village in the easstern region were buried  by the mudslide 

9 Peter asked Mary if she wanted to travel to space one day