Răspunsuri

2014-03-23T16:31:23+02:00
A+b+c=87
a=2b⇒a:2=b
c=a:2-5⇒c=b-5
Atunci se obtine: 2b+b+b-5=87⇔4b-5=87⇔4b=92⇒b=23⇒a=46⇒c=23-5=18