Trong các cặp phương trình sau, cặp phương trình nào tương đương với nhau?

A.  x = 2   v à   x - 2 = 0

B.  x - 2 = 1   v à   x - 2 = 1

C.  x 2 + 3 x + 2 = 0   v à   x 2 + 3 x + 2 = 0

D.  2 x - 1 = 0   v à   x + 2 2 x - 1 x + 1 = 0

Tính giá trị của biểu thức sau : a -  b. Với a là số lớn nhất có năm chữ số và b là số bé nhất có năm chữ số?

A. 99 998

B. 99 989

C. 8 9999

D. 80000

Trung bình cộng của: 12cm, 13cm, 16cm, 27cm là:

A. 17

B.17cm

C.68cm

D. 68

Fill in each numbered blank with one suitable word or phrase.

Online Dating

Dating people online has become an extremely popular custom that has developed as more and more people have figured out the (1)______ of using the Internet as a way of finding love. People of all ages submit to dating online, teens and adults (2)______ searching for that special person by setting up (3) _______on online dating sites and browsing through other people’s profiles. On dating websites, singles are provided the (4) ______of  learning a few things about various potential partners, making their decision of contacting them based (5)_____ dating profile descriptions and photos. Out of the many countries where people practise online dating, the United Kingdom is perhaps the keenest on online dating (6) ______ most English people prefer to browse on the Internet in order to find (7) ______ instead of  trying to meet other persons in bars, clubs, parks or at parties. Dating may vary across the globe, yet as time passes, people develop (8)_______dating customs, such as dating with the help of the Internet. Although this (9)______of dating is mostly practised in the Western civilization, no one can tell for sure what other customs will emerge as the world changes, and whether strict dating will come against some people’s right of choosing whatever partner they see (10)______ for themselves.

Question 8:

A. new

B. interested

C. shocking

D. available

Thể tích của khối lập phương ABCD,A’B’C’D’ có đường chéo AC’ = 6  bằng

A.  3 3

B.  2 3

C.  2

D.  2 2