1 For reasons of safety and comfort

2 In a swimming pool

3 Your 'C-card'

4 Under supervision

a) \(\dfrac{2}{3}+\dfrac{3}{4}=\dfrac{8+9}{12}=\dfrac{17}{12}\)

-> 1 1/3 + 4/5 = 4/3 + 4/5 =  20+12/15 = 32/15

vậy x có thể = 14/14 = 1 (x thuộc N)

co vong 1 to trug

1 are you wearing - looks

2 have - means - do not understand

3 Do you seeing - are looking - Do you recognise - seem - is coming

4 are you doing - are waiting - are getting - wanted - is being - don't know

 1. When / you / get up Answer in the morning?

-> When do you get up in the morning?

2. What / be Answer your favorite food?

-> What is your favorite food?

3. Who / you / Answer send  a lot of text messages or emails to?

-> Who do you send a lot of text messages or emails to?

4. How / you / relax Answer on the weekends?

-> How do you relax on the weekends?

5. Where / be Answer the closest park in this city?

-> Where is the closest park in this city?

6. Why / be Answer trees good for the environment? 

-> Why are trees good for the environment?

ôi nhanh quá

23 . 135 + 75 . 23 - 23 . 10

= 23 x (135 + 75 - 10)

= 23 . 200

= 4600