Chỉ ra các nhóm phân số có giá trị bằng nhau trong các phân số sau:  − 6 − 10 ; − 10 12 ; − 25 35 ; 15 − 21 ; 30 36 ; 36 60

Làm tính chia:

a) 22 x 4 y 2 z   :   5 x 2 y ;                           b) x 6 y 7 zt   :   x 6 y 7 ;

c) ( - 5 x ) 3 y 2 z 2   :   15 x 3 y ;                     d) 3 8 ( xy ² ) 5 : − 1 2 x ² y 2 ;

e) ( - x ³ y ⁶ z ⁹ ) 10   :   ( xyz ) 15 ;                  g) ( x   -   1 ) 6   :   ( x 2   -   2 x   +   l ) .

Mark the letter A, B, C, or D to indicate the word(s) OPPOSITE in meaning to the underlined word(s) in each of the following questions.

In cities, two of the most pressing problems facing the world today also come together: poverty and environmental degradation.

A. destruction

B. poisoning

C. pollution

D. progression

Mark the letter A, B, C, or D to indicate the word(s) CLOSEST in meaning to the underlined word (5) in each of the following questions.

The atmosphere at work was so bad that Brian eventually decided to hand in his notice.

A. notify the boss

B. apply for another job

C. give up his job 

D. be given a better job