tìm lỗi sai và sửa lại:

1.Does your friends often play soccer after school?

Does -> do

2.are you and your friends going to visit Ha Long Bay last week ?

last week -> this week

3. My brother often go swimming everyday.

go -> goes

Minus two degrees Celcius

u,e,o,a,i đọc là uể oải cho dễ nhớ

2% = \(\frac{2}{100}\)

f(x) chia hết cho 3 với mọi x

=> f(0) chia hết cho 3 => C chia hết cho 3 

f(1) ; f(-1) chia hết cho 3 

=> f(1) = A+B +C chia hết cho 3 và f(-1) = A - B + C chia hết cho 3

=> f(1) + f(-1) chia hết cho 3 và  f(1) -  f(-1) chia hết cho 3 

f(1) + f(-1) chia hết cho 3 => 2A + 2C chia hết cho 3 => A + C chia hết cho 3 mà C chia hết cho 3 => A chia hết cho 3

f(1) - f(-1) chia hết cho 3  => 2B chia hết cho 3 => B chia hết cho 3

Vậy.......................

All the teachers love him because his conduct is good.

Because of his good conduct, all the teachers love him.

 . We couldn’t study because it was noisy.

   - Because of  the fact that it was noisy, we couldn't study.

 His wife usually gives him a list because he often forgets things.

   - Because of the fact that he often forgets things, his wife usually gives him a list.

He is dismissed because of being late for work often.

      - Because he is often late for work, he is dismissed.

 Because of driving too fast, he caused a serious  accident.

      - Because he droves too fast, he caused a serious accident.

 Because he got up early, he wasn’t late for the first train.

      - Because of getting up early, he wasn't late for the first train.

He carried the bed onto the roof of his house because of the hot weather.

      - Because the weather is hot, he carried the bed onto the roof of his house.

I couldn’t do the test because it was difficult.

      - I couldn’t do the test because of the fact that is was difficult.   

Because of not knowing Russian, I’ve had to have the document translated into French.

      - Because I don't know Russian, i've had to have a document translated into French.

3x -15=2x(x-5)

<=> 3x -15 =2x²-10x

<=>2x²-13x+15=0

<=>x=5, x= 3/2