Võ Phương Linh's Profile

       Vậy a(a+1) + 1 > 0 với mọi a 

Giải hệ phương trình sau: 
 

1. x² + y²  =  xy 
2. x² + y² - 2(x + 2y) + 5 = 0

6. Before my father taught me how to use the computer, I hadn't known how to use it.
7. When I arrive at the station, I will call you.
8. My brother is very out-going but I am quite reserved.
9. While Peter was walking home, he was robbed of his wallet.
10. I don't have a pet, because my mother dosen't allow me to have one.

(x²+1)² + (x+1)(3x² - 4x - 5)

(1) không biết là phải đề thiếu không. Mình nghĩ phải là: hardly say (Dịch: hầu như không thể nói)
(2) made (Make progress: tiến bộ)
(3) during
(4) the 
(5) took (take a course: tham gia một khóa học)
(6) stayed
(7) up (pick up: học hỏi qua kinh nghiệm) 
(8) from 
(9) improved
(10) back

SIMILARITY:  diễn tả một sự việc sẽ xảy ra với điều kiện
DIFFERENCE: 
"If I have an apple, I will share it with you" : This is the first conditional sentence which is used to talk about an event that can happen in the present or in the future if there is a certain condition ( with "have an apple" is a condition that can happen now or in the future).
"If I had an apple, I would share it with you" : This is the second conditional sentence which is used to talk about something that CANNOT happen in the present if there is a certain condition ( Now, the speaker doesn't have an apple, but the speaker is supposing that he has an apple).   

Robbie is a bit of a trivia master, he knows the answer to all kinds of weird questions.

a) x⁴ - 2x³ + 4x² - 4x + 4 = 0
b) x⁴ - 2x³ + 3x² - 4x + 4 = 0