ban k minh minh se ket ban voi ban

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

\(\Rightarrow1⋮n+1\)(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 \(n=0\)

thanh 5 hang

a)6a la 8

b)6b la 9

6c la 10

chu y : dap an tren la moi hang 

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

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

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

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

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

 1 . is 

2. teaches

3. goes

4. starts

5. ends

6. has

7. watches

8. reads

9. works

10. goes 

ban kia lam dung roi do

k tui hna

thanks

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

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