Question

[son goku]

ab x99=aabb. Tìm a; b

Answer 1

[Đinh Bảo Châu Thi]

ab x99=aabb.

 (a x 10 + b) x 99 = ax1000+a100+b10+b

a x 990 + b x 99 = ax1100+b11

chuyển vế) bx99-b11=ax1100-a990

bx 88=ax110

88=ax110/b

88/110=a/b

4/5=a/b

suy ra a=4; b=5