34x5y chia hết cho 36 suy ra 34x5y chia hết cho 9 và chia hết cho 4

* chia hết cho 4: có 2 chữ số tận cùng chia hết cho 4

  suy ra 5y có các trường hợp 52 và 56

* chia hết cho 9: có tổng các chữ số chia hết cho 9

  suy ra có 2 trường hợp:- (3+4+x+5+2) chia hết cho 9  suy ra x bằng 4

                                        - (3+4+x+5+6) chia hết cho 9 suy ra x bằng 0 hoặc 9

suy ra có 3 cặp số (x,y) đó là: (4;2),(9;6),(0;6)

few mình nghĩ vậy

trang phục -_-

lk

1.school 

2. name 

3. yard

4. reading 

5. next

6. classroom

7. keep 

8. sit 

9. more 

10. every

likeeeeeee

1.school

2.words 

3.yard

4.reading

5.connected

6.classroom

7.keep

8.sit

9.more

10.every

like:)))))))))))))))

1. They/worried/that/some people/use/robots/do/bad things.

=> They are worried that some people will use robots to do bad things.

2. If/people/plant/more trees/area/there/be/no/floods

=> If people plant more trees around this area, there will be no floods.

1) When/Nam/ten/he speak/ English/phone.

When Nam was ten, he spoke English on phone.

2) My sister/write/poems/she eight.

My sister wrote poems when she was eight

3)They/worried/that/some people/use/robots/bad things.

They worried that too some people to use robots is wrose things  

4)If/people/plant/more trees/area/there/be/no floods.

If people plant more trees, the erea there will be no flood.

5) If/we/recycle/old newspapers/we/save/lot/labour/trees.

If we recycle old newspapers we will save a lot of labour of trees