5. We write essays and learn about books in ________.

   A. Literature B. Math C. Science  D. Music

  6. Would you like to go swimming? - _____

   A. Yes, I do B. I’d love to C. Yes, I like D. Yes, please

  7. A cage for a chicken is a__________.

   A. buffalo shed B. chicken shed C. chicken coop D. Both A and B

  8. ____________  go fishing with me next weekend?

     A.  Let’s B. Why don’t we C. Would you like    D. A & B

  9. Students have two __________ each day.

     A. 20-minutes break B. 20-minute breaks C. 20-minute break D. 20-minutes breaks

  10. It’s time _______ recess. Children often play hide-and-seek  __________ recess.

      A. for/at B. to /at C. on/at D. at/at 

11. Fast food is____________.

  A. health B. unhealthy C. healthy D. healthier

  12. Science books are on the shelves _______ the back of the room.

   A. at             B. in        C. on D. for

  13. Nga’s theater group is _____ a play for the school anniversary celebration.

   A. rehearsing B. practicing C. learning D. doing

  14. I think she __________  the party tomorrow.

A. will enjoy  B. enjoy C. enjoys D. is enjoying

15. In the USA, there are two twenty-minute breaks each day.

A. time B. relax C.recess D. free time

16. Washington D.C is the_____________of the United State of America.

A. town B. city C. street              D. capital

17. Students have to do lots of __________in physics.

A. experiments B. housework C. experience D. housewife

18. American teenagers ________ eating in fast food restaurants.

A. want B. would like C. enjoy D. can

19. I am very good at ________things.    

A. fix B. fixes C. to fix D. fixing

20. Hoa’s father works ________hours than Tim’s father.

A. much B. many C. more D.  less (cả hai đều đúng)

21. Ba is a keen student and ____________ his brother.

A. too does B. so is C. so does D. does too

22. Household _______ such as washing machines, vacuum cleaners and steam irons make housework easier.  

A. appliances B. marbles C. essays D. painting 

 b

Căn 42 -6= 6
B đúng

Câu B bạn nhé!

A

B

Mà đáp án nào là đúng thế anh/chị ? 

a) \(\frac{3}{4}x-\frac{1}{4}=2\left(x-3\right)+\frac{1}{4}x\)

\(\frac{3}{4}x-\frac{1}{4}=2x-6+\frac{1}{4}x\)

\(\frac{3}{4}x-2x-\frac{1}{4}x=\frac{1}{4}-6\)

\(x\left(\frac{3}{4}-2-\frac{1}{4}\right)=-\frac{23}{4}\)

\(-\frac{3}{2}x=-\frac{23}{4}\)

\(x=-\frac{23}{4}\div\left(-\frac{3}{2}\right)\)

\(x=\frac{23}{6}\)

b) \(30\%-x+\frac{5}{6}=\frac{1}{3}\)

\(\frac{3}{10}-x+\frac{5}{6}=\frac{1}{3}\)

\(\frac{3}{10}-x=\frac{1}{3}-\frac{5}{6}\)

\(\frac{3}{10}-x=-\frac{1}{2}\)

\(x=\frac{3}{10}-\left(-\frac{1}{2}\right)\)

\(x=\frac{4}{5}\)

c) \(\left(2x-1\right).\left(3x+12\right)=0\)

\(\hept{\begin{cases}2x-1=0\\3x+12=0\end{cases}\Rightarrow\hept{\begin{cases}2x=1\\3x=-12\end{cases}\Rightarrow}\hept{\begin{cases}x=\frac{1}{2}\\x=-4\end{cases}}}\)

Vậy \(x\in\left\{\frac{1}{2};-4\right\}\)

\(a-b\) là bội của 6 nên \(a-b\) chia hết cho 6

\(a-b\) chia hết cho 6 \(\Rightarrow\left(a-b\right)+12b=a+11b\) chia hết cho 6 => \(a+11b\) là bội của 6

\(\left(a+11b\right)+\left(5a+b\right)=6a+12b\) chia hết cho 6 mà \(a+11b\) chia hết cho 6 nên \(5a+b\) chia hết cho 6 => \(5a+b\) là bội của 6

4 KM