1. although they worked hard, they didn't finish the project on time

2. in spite of being tired, she offered to help us

3. no matter what you try to do mary won't go out with you

4 well as my team play we didn't win

5 no matter what they try to do, the police will stop them

6  they like traveling plane, while they don't like travelling by boat

7 although the problem if technical, the train left on time

8 though she is very talented she doesn't play the piano professionally

1 in the future my house will be in the mountains

2 it is surrounded by many tree in the blue sea

3 there is some robots in the house

4 robots will help me hay robots help me

số 17 

A

mk chỉ làm đc mấy câu th

Gọi Ư( n+1; 2 n+3 ) = d ( N* )

n +1 = 2n + 2 (1) ; 2n+3*)   (2)

Lấy (2 ) - (1) ta được : 2n + 3 - 2n + 2 = 1:d => d =1

vậy ta có đpcm 

gọi Ư ( 3n + 2 ; 5n + 3 ) = d ( N* )

3n +2 = 15 n + 10 (1)  ; 5n + 3 =15n + 9 (2)

lấy (!) - (2)  ta được  15n + 10 - 15n - 9 = 1:d => d = 1

Vậy ta có đpcm