Rút gọn phân số 600/800 về dạng phân sô tối giản ta được :

A. 1/2     

B. 6/8     

C. 3/4     

D. -3/4

Complete the following passage

I go on the Internet every day, but I’ve never (1) __________ more than an hour at a time online. I’ve got laptop and also a smartphone, so I can (2) ___________ the Internet anywhere. Today, for instance, I’ve been (3) ____________ three times.

Mainly I just (4) ____________ my friends. I read online magazines and I look (5) __________ information, too. I also compare prices of things, (6) ___________ I’ve never bought anything online because I don’t think it’s safe.

I’m not an Internet addict, but some of my friends (7) ___________. One friend of mine always looks (8) ___________ because he spends all night online. Although he’s got a lot of bad marks for the exams, he hasn’t (9) ___________ his habits.

In my experience, it’s very useful for people who use the Internet (10) ____________.

Question 5:

A. at

B. in

C. for

D. on

Choose the word whose underlined part is pronounced differently from the others

A. sentence

B. letter

C. person

D. twelve

Ta có:

7¹⁰¹ = (7⁴)²⁵.7 = 2401²⁵.7

Vì 2401 chia 10 dư 1 => 2401²⁵ chia 10 dư 1

Mà 7 chia 10 dư 7 => 2401²⁵.7 chia 10 dư 7

hay 7¹⁰¹ chia 10 dư 7

hello

tên : Quốc

làm quen nha

n + 5 chia hết cho n + 1

=> n + 1 + 4 chia hết cho n + 1

Mà n + 1 chia hết cho n + 1 

=> 4 chia hết cho n + 1

=> n + 1 \(\in\)Ư(4)={-4; -2; -1; 1; 2; 4}

=> n \(\in\){-5; -3; -2; 0; 1; 3}.