Răspuns :
a) 64:b=5rest 4
64:5 rest 4=b
=12
64:12=5 rest 4
b) 91:c=9 rest 1
91-1 =90
90:c=9=>90:9=10
=>c=10
91:10=9 rest 1
64:5 rest 4=b
=12
64:12=5 rest 4
b) 91:c=9 rest 1
91-1 =90
90:c=9=>90:9=10
=>c=10
91:10=9 rest 1