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A=(n-2)/(n+3)= (n-3+5)/(n-3)= 1+ 5/(n-3)
Để biểu thức A lớn nhất thì 1+ 5/(n-3) LN. Mà 1>0; 1 ko đổi => 5/(n-3) LN. 5>0; 5 ko đổi=> n-3 nhỏ nhất, n-3>0. Mà n thuộc Z nên n-3 thuộc Z=> n-3=1 => n=4
Khi đó A =4+2/4-3= 6/1=6
My brother lives in HCM city.He(1)IS a teacher of math.He goes to work(2)FROM Monday to Saturday.The school starts(3) AT 7.00 in the morning and (4)FINISHES at eleven fifty.After work,he comes back(5) and has lunch at (6)A quarter past twelve.In the afternoon,he(7)DOES the housework and plays games In the (8)EVENING after dinner he watchesT.V books .He goes to bed at half(10)PAST eleven.
1. There are lots of gray clouds in the sky. It is raining.
2. Children riding e-bikes to school.
I.
Hello! My name is Frankie. I live in Brisbane, Australia. I am twelve (1) years old. I am a schoolgirl. This is (2) my school. It is in the suburbs of the city. There are 24 (3) students in our school. The school (4) has a garden, and there are many flowers in our school. (5) They are very nice. We like our school so much.
II.
1. School year starts in September
2. I usually have bread and eggs for breakfast
3. My father finishes work at 4:30 everyday
4. How often do you go to the theater?
5. We never camping on Monday
IX. Điền 1 từ thích hợp vào chỗ trống (5p)
Hello! My name is Frankie. I live in Brisbane, Australia. I am twelve (1) years old. I am a schoolgirl. This is (2) my school. It is in the suburbs of the city. There are 24 (3) classrooms in our school. The school (4) has a garden, and there are many flowers in our school. (5) Our are very nice. We like our school so much.
X. Dùng từ gợi ý viết thành câu hoàn chỉnh (10p)
1. School year/ start/ September. --> School year starts in September. 2. I/ usually/ bread/ eggs/ breakfast. --> I usually have bread and eggs for breakfast. 3. My father/ finish/ work/ 4:30/ everyday. --> My father finishes work at 4:30 everyday. 4. How often/ you/ go/ theater? --> How often do you do to the theater? 5. We/ never/ camping/ Monday. --> We never go camping on Monday. |
I. Điền vào chỗ trống bằng một giới từ thích hợp
1. Ha Noi is bigger than Thai Binh ( big )
2. Do you usually play video games ? ( usual )
3. This is the most beautiful house in my village ( beautiful )
4. Peter is a taxi driver ( drive )
Ex1 : điền động từ tobe ( am , is , are ) thích hợp vào chỗ trống :
1. Bangkok is in thailand
2. New delhi is in Indonesia
3. Guangzhou and Nanning are in china
4. Taipei is in the philippines
5. Bandar Seri Begawan are in Brunei
6. Jakarta is in Malaisia
7. Surat and Bangalore are in sri lanka
8. Vientiane is in vietnam
(Để có đáp án chắc chắn hơn bạn hãy tham khảo cách sử dụng am, is, are trên mạng)
a) 3 ∈ Z
b) -3 ∉ N
c) 1 ∈ N
d) N ⊂ Z
e) 1;-2 ∈ Z