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You should get up early every day.
Can she look after herself when her mother is away?
Both of us playing baseball.
Why don't we eat out tonight?
Lan can’t swim as well as Han.
Neither my father nor my mother drink tea.
Both my father and my mother don't drink tea.
What about visiting the museum this afternoon?
Could you show me how to get to the station?
We went to Liverpool by train last Sunday.
You won’t need to go to the meeting next week.
Sonia isn't interested in roller-skating.
You had to rike the bike more carefully next time.
I prefer listening to music to going to the circus.
The rain prevented us from going to school.
We enjoy visiting museums when we have leisure time.
Jenny dislikes reading poetry boring.
Her new house is smaller than her old house.
Peter is the tallest student in my class.
The white dress is cheaper than the black one.
In spite of the weather being bad, it did not delay the traffic.
If you don't work hard, you will fail the exam.
It takes me two hours to get to Hai Phong by train.
What is the height of that building?
The water was very cold, so the children couldn't go swimming.
Don't forget to wake me up at eight tomorrow morning.
I am interested in going to the cinema with my friends at weekends.
Ann is a dangerous driver.
You don't have to finish all your work today.
How much do these rackets cost?
What is wrong with your car?
My mother is a very good cook.
81 existence
82 athletes
83 athletic
84 athletics
85 athletic
86 equipped
87 varieties
88 Variety
89 variously
90 enthusiastically
91 It is the most impressive toy museum I have been to
92 I last went to the cinema 2 months ago
93 I am not used to staying up late
94 How long has John studied Spanish?
95 This is the first time they have ridden a horse
96 I have never looked up to a scientist so much
97 My sister and I are used to decorating the house at Xmas
98 While we were doing our test, the principal visited our class
99 John has been playing his game of tennis for 4 hours
100 My parents used to live in the USA when they were young
101 I am not used to getting up early
102 My mother doesn't get used to using a computer
103 Mr Michael used to grow tulips
104 John isn't used to the cold weather
105 We haven't called each other for 2 weeks
106 How long have you had this car?
107 When did Kate last talk to her boss?
108 My parents have drunk since it started to rain
109 After facing the matter, she decided to go away
110 Before going out for a walk, Hoa learned her lesson
111 C
112 D
113 D
114 D
115 A
116 C
117 A
EX3: 1 VÀ 5 .Help them have a have a good meal.
2.Help people to find the correct bus, train and get to the place they want to go to.
3. Help them not be cold in the winter, not have a flu.
4. Help them have the good knowledge to get a good job and life.
EX4:
I used to tutoring children from poor familles in HCMC. I would like to try “Volunteering to gi ve information in bus station and railway stations, offering coupons for free chicken noodle soup for the poor, giving away warm clothes to homeless people and offering meal at 5,000 VND for the poor”. I want to do because I want to help the poor people.
1.
\(2n+1\) luôn lẻ \(\Rightarrow2n+1=\left(2a+1\right)^2=4a^2+4a+1\Rightarrow n=2a\left(a+1\right)\)
\(\Rightarrow n\) chẵn \(\Rightarrow n+1\) lẻ \(\Rightarrow\) là số chính phương lẻ
\(\Rightarrow n+1=\left(2b+1\right)^2=4b^2+4b+1\)
\(\Rightarrow n=4b\left(b+1\right)\)
Mà \(b\left(b+1\right)\) là tích 2 số tự nhiên liên tiếp \(\Rightarrow\) luôn chẵn
\(\Rightarrow4b\left(b+1\right)⋮8\Rightarrow n⋮8\)
Mặt khác số chính phương chia 3 chỉ có các số dư 0 và 1
Mà \(\left(n+1\right)+\left(2n+1\right)=3n+2\) chia 3 dư 2
\(\Rightarrow n+1\) và \(2n+1\) đều chia 3 dư 1
\(\Rightarrow n⋮3\)
\(\Rightarrow n⋮24\) do 3 và 8 nguyên tố cùng nhau
1 A
2 B
3 D
4 B
5 A
6 C
7 A
8 B
9 A
10 C
11 C
12 B
13 D
14 D
15 D
16 C
17 B
18 A
19 C
20 A
21 D
22 B
23 C
24 C
25 B
26 C
27 A
28 C
29 A
30 B
31 B
32 D
33 C
34 A
35 B
36 D
37 C
38 C
39 B
40 D
41 B
42 C
43 D
44 A
45 B
46 C
47 A
48 D
49 B
50 B
ối dồi ôi lớp mik á đi đến lớp cởi mẹ khẩu treng re , re chơi cũng ăn quà vặt cớ phải gọi là trả re lề nếp j , à thì kể thế thoi :.