Change the following sentences into passive voice.

1. My friend, Janet was told not to come here again

2. 2 sillings was given to me to change at the shop.

3. he was promised a book by her

4. the wall white hads been painted .

5. it is time the cows were brought in.

6. I was told to go away.

7. He hasn't been seen for years

8. the little girl will be looked after carefully by her.

9. our dog was run over by a car.

10. Most students love school uniforms.

11. their car was stolen

12. the room will be filled After a few days by dust .

có +117= ;+  =-117

giả sử x,y khác 2

do x,y nguyên tố nên x,y lẻ 

=> , đều lẻ=> - chẳn (vô lý)

do đó trong x,y có 1 số bằng 2

mà x<y=>x=2

có ²= +117=121

=>y=11

vậy x=2,y=11