Giải phương trình  x 2 =   -   2 .

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

People are now far more materialistic than their predecessors years ago.

A. monetary

B. greedy

C. object-oriented

D. spiritual

Hàm số y = x − 2 1 − x 2 có đạo hàm là:

A.  y ' = − 2 x − 2  

B.  y ' = x 2 + 2 x 1 − x 2  

 C.  y ' = − x 2 + 2 x 1 − x 2  

D.  y ' = x 2 − 2 x 1 − x 2