Bài này giống bài bình thường khác mỗi nhiều số

a) Ta có  4n-5=4n-2+3 

Do 4n-5 chia hết cho 2n-1 nên 4n-2+3 chia hết cho 2n-1

=> 3 chia hết cho n-1

=> n-1 thuộc Ư(3)={1;3;-1;-3}

=>n={2;4;0;-2}

Do n thuộc N nên n={2;4;0}

các câu còn lại tương tự  

tick nha

1. She spends a lot of time beautifying herself everyday (beauty)

2. Some students enjoy doing scientific experiments (science)

3. There is a variety of styles for you to choose.(various)

4. He felt happily than ever when he heard the news(happy)

5. You can buy lots of sports equipment at the store over there.(equip)

The man talks to the principal is my form teacher.
Mk nghĩ vậy vì: + Nếu chọn đáp án B thì sai lun, The man là số ít mà
+ Nếu chọn đáp án C cũng sai nốt. Vì nếu ở quá khứ thì tobe ko phải là is
+ Nếu chọn đáp án D thì thiếu tobe rùi. Là thì tiếp diễn mà, đúng kh?

1. Yes, I do
2. I play it at home
3. Twice a week
4. Video games can be addictive. Some people or students like playing video games. It makes them feel tired. Video games is not good for your health. Gamers become lazy and neglect necessary activities such as exercise, eating healthy and proper foods, damaged eyesight, headaches and the inability to sleep.