Răspuns :
A+b= 53
A:b= 9 r 3
A= 9•b+3
9•b+3+b=53
10•b+3=53
10•b= 53-3
10•b= 50
B= 50:10
B= 5
A= 53-5
A= 48
A:b= 9 r 3
A= 9•b+3
9•b+3+b=53
10•b+3=53
10•b= 53-3
10•b= 50
B= 50:10
B= 5
A= 53-5
A= 48