user-avatar
dnkhue2001
2 năm trước
Bài 1: Không làm tính xét xem tổng sau có chia hết cho 12 không?Vì sao? 120a+36b (với a;b thuộc N) Bài 2: Chứng tỏ rằng: a,Hiệu của một số có ba chữ số với tổng các chữ số của nó chia hết cho 9 b,Hiệu của một số có hai chữ số với số đó viết theo thứ tự ngược lại thì chia hết cho 9 Bài 3:Cho số abc - deg chia hết cho 13.Chứng tỏ rằng số abcdeg chia hết cho 13 HỨA VOTE + CẢM ƠN CÁC BẠN GIÚP MIK NHA
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

Read the following story and write true (T) or false (F). (1.5pts) When Dave was young, he played a lot of games, and he was thin and strong, but when he was forty-five, he began to get fat and slow. He was not able to breathe as well as before, and when he walked rather fast, his heart beat painfully. He did not do anything about this for a long time, but finally he became anxious and went to see a doctor, and the doctor sent him to a hospital. Another young doctor examined him there and said, " I don't want to mislead you, Mr. Dave. You are very ill, and I believe that you are unlikely to live much longer. Would you like me to arrange for anybody to come and see you before you die? Dave thought for a few seconds and then he answered, "I'd like another doctor to come and see me". Your answers: 1. Dave was fat and slow until he was forty five. 2. As soon as Dave had trouble in breathing and walking, he went to see a doctor. 3. Dave was afraid he was ill. 4. The young doctor thought Dave was going to die soon. 5. He wanted to see another doctor, first. 6. Dave did not trust the young doctor.

2018 © Loga - Không Ngừng Sáng Tạo - Bùng Cháy Đam Mê
Loga Team