bài jjjjjj

Bìa 2 : Tìm các chữ số a,b sao cho :

a ) 14a8b chia hết cho 2 , 3 ; chia hết cho 5 và 9 ; chia hết cho 2,8,5 ; chia hết cho 4,7,9

b ) 34a5b chia hết cho 36 ; chia hết cho 45 ; chia hết cho 44

c )c71a3b chia hết cho 28 ; chia hết cho 5 , 7 , 9 ; chia hết cho 4 , 7, 9

tại bạn chưa tự tin về bạn thân bạn hãy cố gắn để bạn tự tin nha 

Số 12 nha

12 nha

Link nek mấy bn ơi

/hoi-dap/question/62606.html

How can I help for you ?

a+b+c = 0 => a+b=-c ; b+c=-a ; c+a=-b

=> (1+a/b).(1+b/c).(1+c/a) = a+b/b . b+c/c . c+a/a = -c/b . (-a)/c . (-b)/a = -abc/abc = -1

k mk nha

\(\Leftrightarrow x^2-5x+7-\frac{1}{2}>0\Leftrightarrow\left(x^2-\frac{2.5}{2}x+\frac{25}{4}\right)+\left(7-\frac{1}{2}-\frac{25}{4}\right)>0\)

\(\Leftrightarrow\left(x-\frac{5}{2}\right)^2+\left(\frac{7.4-2-25}{4}\right)>0\) 

<=> (x-5/2)^2+1/4>0

(x-5/2)^2>=0=> (x-5/2)^2+1/4>=1/4>0 => dpcm

\(\)

chac ko ban 

 tui lam vay dung hay sai moi nguoi

1. I enjoy listening to pop music every day.

2. In the city, children play less freely than in the countryside.

3. An ordinary bicycle goes more slowly than a sport bicycle.

4. Nam can swim better than Hung.

5. My brother really enjoys hanging out with friends.

6. I love playing soccer.

7. How much are these clothes?

...listening to pop music every day

...play less freely than in the countryside

...more slowly than a sport bicycle

...better than Hung

...hanging out with friends

...playing soccer best

...are these clothes?