Răspunsuri

2014-11-06T11:27:17+02:00
A+1=40+b-40=c-1=a+b+c-40
a+1=b=c-1=a+b+c-40
b-1+b+b+1-40=3b-40=b
2b=40
b=20
a+1=20
a=19
20=c-1
c=21