bài 1: 

\(\left\{{}\begin{matrix}x+y=57\\4x-2y=6\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}4x+4y=228\\4x-2y=6\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}6y=234\\x+y=57\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}y=39\\x=18\end{matrix}\right.\)

d

d

b

c

12) D

13) D

14)B

15)C

12. Do you have ____ money ?
A. a         B. some           C. a lot           D. any
13. She can sing ____.
A. beauty        B. beautiful         C. beautify            D. beautifully
14. At the moment, we ___ for the next exam
A. prepare       B. are preparing         C. prepared       D. have prepared
15. "-_____ from Ha Noi to Da Ngang?
       - It's about 800 kilometers"
A. How far        B. How far it is        C. How far is it        D. How far is
 

28.A

29.C

30.B

31.B

16, Jane hasn't cooked for her family since she was at high school

17, The last time Jane cooked for her family was when she was at high school

1B

2C

3C

4C

5D

6C

7D

12B

13B

14C

15D

16A

17C

18D

19C

20D

21C

22C

23D

Bài 33:

a: \(x^2-3x+2=\left(x-2\right)\left(x-1\right)\)

a: \(\Leftrightarrow\left\{{}\begin{matrix}3x+6y=4\\x+4y=2\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}y=\dfrac{1}{3}\\x=\dfrac{2}{3}\end{matrix}\right.\)