Dich cau tren ha bn?

ab+ba

= 10a+b+10b+a

= 11a+11b

= 11(a+b)

55 = 11.5

=> ƯCLN(ab+ba, 55)=11.

1.They are big and trong.

2.Their house is big.

3.My father is thin and tall.

4.Ba's brother is a gymnast.

5.I'm tall but my friend is short.

6.His mother is short and fad.

It's+mau sac OR her hair is+mau sac