Question

a,bc+ab,c=21,12

 

Answer 1

c=2

b=9

a=1

tick nhé

Answer 2

a+0,b+0,0c+10a+b+0,c=21,12

11a+1,1b+0,11c=21,12

=>a=1

=>1,1b+0,11c=10,12

1,1b+0,11c=9,9+0,22

=>b=9;c=2

Vậy a=1;b=9;c=2

Answer 3

a=2

b=9

c=1

tick minh nhe