So sánh

a) ( -12). (- 8) với 90;

b) ( - 21) . (- 3) với 59;

c) (-15).(- 28) với 400;

d) ( - 22).( -21) với 420.

Tìm số nguyên x biết:

a) x.(x - 1) = 0

b) (x + 1)(x - 2) = 0

Mark the letter A, B, C, or D to indicate the most suitable response to complete each of the following exchanges.

Henry is talking to his mother.

-Henry: “ I've passed my driving test”.

-His mother: “______”.

A. All right.

B. That's too bad.

C. That's a good idea.

D. Congratulations!

Giải phương trình x 2 - x + 1 x 2 + 4 x + 1 = 6 x 2