Răspuns:
a=b+80
a=12b+3
b+80=12b+3
80-3=12b-b
77=11b =>b=7 =>a=87
124:5=24
10
__
=24
=20
____
==4 rest
879:4=219
8
_
=7
=4
__
=39
=36
____
==3 rest
1212:12=101
12
___
==1
==0
____
==12
==12
_____
===0 rest
3002:17=176
17
__
130
119
____
=112
=102
_____
==10 rest
1256:13=96
117
____
==86
==78
_____
===8 rest