Đk a,b ∈ Z
Ta có: (5a+7b)/9 là số nguyên=>(20a+28b)/9 số nguyên
Do b ∈ Z =>27b/9 ∈ Z
=>(20a+28b)/9+27b/9 ∈ Z
Mà (20a+28b)/9+27b/9 =(20a+28b+27b)/9=(20a+55b)/9 ∈ Z
chia (20a+55b)/9 cho 5 ta được (4a+11b)/9
Lại có (20a+55b)/9 ∈ Z Suy ra (4a+11b)/9 ∈ Z
1. I want ............................ apple from that basket. ............................ apple a day keeps the doctor away. 2. ............................ church on the corner is progressive. 3. Miss Lin speaks ............................ Chinese. She likes to play ............................ volleyball. 4. I borrowed ............................ pencil from your pile of pencils and pens. 5. One of the students said, " ............................ professor is late today." 6. I bought ............................ umbrella to go out in the rain. 7. My daughter is learning to play ............................ violin at her school. 8. Please give me ............................ cake that is on the counter. 9. I lived on ............................ Main Street when I first came to town. 10. Albany is the capital of ............................ New York State. 11. My husband's family speaks ............................ Polish. 12. ........................... boy in the corner is my friend. 13. Our neighbors have ............................ cat and ............................ dog. 14. What ............................ nice armchair! 15. Where is ............................ nearest police station? 16. What is ............................ cost of ............................ goods you buy? 17. There is ............................ bakery next to ............................ post office. 18. Can you tell me ............................ way to ............................ hotel please? 19. Is he ............................ new student here? Yes, he is ............................ best student in my class. 20. What is ............................ name of the station? 21. I like ............................ kilo of meat. 22. Mexico is ............................ large country. 23. My friends have ............................ my car today. 24. I will go to ............................ party to night. May I have your ............................ phone number? 25. ............................ Milk is good for you. Money can’t buy ............................ happiness.
Đốt cháy hoàn toàn 0,11gam este đơn chức no mạch hở thu được 0,22 gam CO2 . Công Thức phân tử của este là . Đốt cháy hoàn toàn 2,1 gam este X Đơn chức no, mạch hở cần dùng 1,568 lit khí O2 (đkc) .Este X là Xin cách giải ạ ♥️
giúp mik bài 2 với các tiền bối
II. Rewrite the following sentences in reported speech. 1. Susan said, “Every day I am teased and bullied and I don't know what to do!” 2. "I'm having a really hard time getting along with my parents,” Quan told me. 3. "Do I need a tutor when I get so much trouble in Maths?” Mai asked her mother. 4. "I'm scared to talk to other students at school, and I've never told my parents about being depressed,” Mi told Nick. 5. David asked the doctor, “Why do I often sleep in class although I try hard to break my bad habit?” 6. “Whenever I read a book, my mind starts to wander after a while, and I can't read anymore,” said Phong.
help me zới, cầu xin đóa thanks
Trình bày cảm nhận về câu thơ” Giếng nước gốc đa nhớ người ra lính” bằng đoạn văn ngắn khoảng 5 câu.
Đề bài: Tìm giá trị của các biểu thức sau MONG MNG GIÚP Ạ.CẢM ƠN MNG NHIỀU
Tính nhanh: `(-3,5).(-3,7)+|-3,5|.6.3+ 65`
ai nhanh và đúng 5 sao, 1 câu trả lời hay
16. Do you agree with the famous saying “The happiest people are those who bring _______ to others?” (HAPPY) 17. We’d like to offer your school a ______ of 2 million dong. (DONATE) 18. The volunteers also help the _______ with their housework. (OLD) 19. We participate in a campaign to provide _______ for poor children. (EDUCATE) 20. I like helping _______ children to read and write. (MINOR) 21. We started a campaign for _______ eradication in the summer of 2000. (LITERATE) 22. Many ethnic minority students from the ________ Highlands took part in the campaign. (NORTH) 23. I think this is an _______ way to help people in remote and mountainous areas to read and write. (AFFECT) 24. We consider it an _______ job to help poor in our home village. ( HONOUR) 25. Are there any people unable to read and write in your _______. (NEIGHBOUR) 26. The number of literate females fell _______ between 1998 and 2004. (DRAMA) giúp em vs ạ, em hứa trả đủ em cảm ơn
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