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1. How luxurious car is?
2. I spend an hour doing my homework every evening.
3. I am fastest runner.
4.Does your school have a library?
5.What is your age?
6. Would you like to bring me a cup of tea?
7. I don't hard- working more than my sister.
8. Is this a best refrigerator you have?
9. It is difficult to find an apartment in a big city.
10. There are often 28 days in February .
- How luxurious the car is!
- I spend an hour doing my homework everyday.
- I am the fastest runner.
- Does your school have a library?
- What is your age?
- Would you like a cup of tea? / Would you like me to bring you a cup of tea?
- I don’t work so / as hard as my sister (does).
- Is this the best refrigerator you have?
- It is not easy to find an apartment in a big city.
10 There are often 28 days in February
gọi ƯCLN (2n + 5 ; 3n + 7 ) là d
ta có 2n + 5 chia hết cho d => 3 ( 2n + 5 ) chia hết cho d <=> 6n + 15 chia hết cho d (1)
3n + 7 chia hết cho d => 2 ( 3n + 7 ) chia hết cho d <=> 6n + 14 chia hết cho d (2)
=> ( 6n + 15 ) - ( 6n + 14 ) chia hết cho d hay 1 chia hết cho d => 2n + 5 , 3n + 7 là 2 số nguyên tố cùng nhau
nên ƯCLN (2n + 5 ; 3n + 7 ) là 1
Đặt UCLN(2n + 5 ; 3n + 7) = d
2n + 5 chia hết cho d
< = > 3(2n + 5) chia hết cho d
< = > 6n + 15 chia hết cho d
3n + 7 chia hết cho d
< = > 2(3n + 7) chia hết cho d
< = > 6n + 14 chia hết cho d
< = > [(6n + 15) - (6n + 14)] chia hết cho d
1 chia hết cho d < = > d = 1
Vậy UCLN(2n + 5 ; 3n + 7) = 1
OKI !!!
79.start
80.favorite
81.The stamps for your letter cost 8 000 VND
82.He grows rice and vegetables
83.same
84.fixing
85.My father is reading a newpaper now .
86.You shouldn't eat too much meat
87.collection
88.an
89.starts
90.geography
91.The blue dress is cheaper than the red one
92.Lien's brother is practicing the guitar now
93.cartoon
94.taller
95.chair
96.We went to the Ho Chi Minh city tram last year
97. They are playing volleyball in the school yard
98.will be
99.Minh usually spend one hour on computer games
100.The souvenir shop is in front of the bookstore
Ta có : 158/2,8 = 56,42 ( dư 0,024 )
Vậy số dư là 0,024 khi lấy đến 2 chữ số ở phần thập phân của thương.
Một vật có khối lượng 500 N thì nặng 50 000 g hoặc 50 kg.
22.do
23.You should do morning excercise regurlary
24.They are going to see a movie tonight
25.front
26.first
27.different
28.learns
29.Minh goes swimming three times a week
30.The NIle river is longer than the Mekong river
31.so
32.part
33.about
34.What do you usually do at recess?
35.There was a toystore next to the museum
36.with
37.street
38.call
39.address
40.what do you do in your free time?
41.They will fly to Brazil next month
42.from
43.be
44.That
45.Trung usually borrows his brother's motorbike