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5 tháng 11 2017

ban k minh minh se ket ban voi ban

4 tháng 11 2017

\(2n+3⋮n+1\Leftrightarrow2\left(n+1\right)+1⋮n+1\)

\(\Rightarrow1⋮n+1\)(vì 2(n+1) chia hết cho n+1)

\(\Rightarrow n+1\inƯ\left(1\right)=\left\{1\right\}\)

\(\Rightarrow n+1=1\)

\(\Rightarrow n=0\)

Vậy \(n=0\)

4 tháng 11 2017

thanh 5 hang

a)6a la 8

b)6b la 9

6c la 10

chu y : dap an tren la moi hang 

4 tháng 11 2017

để 123x44y chia hết cho 9 thì :

1+ 2+3+x+4+4+y chia hết cho 9

=> (14+y) chia hết cho 9 

=> y= 4

* Supply the correct forms and tenses of these verbs:1. He often (go)................... to school on foot.2. It (rain)............................ very hard now.3. The sun (warm)........................... the air and (give).................. us light.4. Look! A man (run)...................... after the train.5. She (go).................... to school everyday.6. Bad students never (work)..............................hard.7. It often (rain)............... in the summer. It...
Đọc tiếp

* Supply the correct forms and tenses of these verbs:

1. He often (go)................... to school on foot.

2. It (rain)............................ very hard now.

3. The sun (warm)........................... the air and (give).................. us light.

4. Look! A man (run)...................... after the train.

5. She (go).................... to school everyday.

6. Bad students never (work)..............................hard.

7. It often (rain)............... in the summer. It (rain)........................ now.

8. The teacher always (point)............ at the black-board when he (want).................. to explain something.

9. Mother (cook).......... some food in the kitchen at the moment, she always (cook)............ in the morning.

10. I always (meet)................ him on the corner of this street.

11. Where you (go).................... now? - I (go)....................... to the theater.

12. He (not do).............................. morning exersices regularly.

13. He (do)..............................morning exersices now?

14. Water (boil)............................at 100 defrees centigrade.

15. He (meet)........................ the dentist next week

6
4 tháng 11 2017

1)goes

2)is raining

3)warms |gives 

4)is running 

5)goes

6)work

7)rains | is raining

8)point | wants

9)is cooking | cooks

10)meet

11)going | am going

12)don't do.

13) Is he doing morning exercise now?Chỉnh sửa cả câu nhé

14)boils

15)is meeting (tôi ko chắc)

k cho tớ nhé

4 tháng 11 2017

1 goes 

2 rains

3 warms / gives

4 runs 

5 goes 

6 work

7 rains / rains

8points / wants

9 cooks / cooks

10 meet

11 go / go

12 doesn't 

13 does

14 boils

15 meets

4 tháng 11 2017

Son is.... from Vietnam. He (speak).....speaks......Vietnamese. He can (speak)..speaks.... English, too. He (live)..lives....with his family in Ho Chi Minh City. He often (go) ...goes........ to school on Sundays to prace his English. Tomorrow (be). is...... Sunday. He (walk)...will walk... to school tomorrow. Now he (read)....is reading...... a book

4 tháng 11 2017

is / speaks / speaks / lives/ goes/is/walks/reads

4 tháng 11 2017

 1 . is 

2. teaches

3. goes

4. starts

5. ends

6. has

7. watches

8. reads

9. works

10. goes 

5 tháng 11 2017

ban kia lam dung roi do

k tui hna

thanks

4 tháng 11 2017

x=5(vì chỉ có thể là 5 vì 3+4+5=12 chia hết cho 3 và tận cùng phải là 5 vì nếu là 0 thì 3+⁴+0 =7 ko chia hết cho 3)

k nhé

4 tháng 11 2017

Để 34x \(⋮5\)

\(\Rightarrow x=0;5\)

Xét trường hợp x = 5

\(\Rightarrow345⋮3\).Vì \(3+4+5=12⋮3\)(thỏa mãn)

Xét trường hợp x = 0

\(\Rightarrow\)340 không chia hết cho 3 . Vì \(3+4+0=7\)không chia hết cho 3 (ko thỏa mãn)

Vậy x = 5