Răspunsuri

2014-11-05T09:34:31+02:00
A+b=45
a+b=54-a+9
a=45-b
45-b+b=54-a+9
45=63-a
a=18
b=27


2014-11-05T10:07:15+02:00
A+b=45
54-a=45-9 
54-a=36
54=36+a
a=54-36
a=18
18+b=45
b=45-18
b=27