2x+3 chia hết cho x-1

=>2x-2+5 chia hết cho x-1

=>2(x-1)+5 chia hết cho x-1

Mà 2(x-1) chia hết cho x-1

=>5 chia hết cho x-1

=>x-1\(\in\)Ư(5)={-5,-1,1,5}

=>x\(\in\){-4,0,2,6}

III.give the right form of the verbs in bracket: simple future of simple present.

1. I(go)go to school erery day.

2. she(meet)meets us at the airport.

3. they(pay)will pay their bill tomorrow.

4.he promises he(leave)will leave before the sun(rise)

5. I am sure that he(like)will like our new flat

6. People( not use)don't use this road very often.

7. we(wait)will wait here until you ( come)come back tomorrow.

8. jane (clean)cleans this room daily

9. my class(finish)will finish at five o' clock so I ( see)will see you at 5. 15

10. I (phone)will phone you on sunday

Bạn cho chúng 1 Ư chung đi 

mk bảo bình cơ

ban danh van tu dung cho minh nghe duoc kg