Ex 8
(a+b+c):3=144⇒a+b+c=432
(a+b):2=78,5⇒a+b=157
din ultimele doua relatii⇒c=432-157⇒c=275
Ex 9
(a+b+c):3=28⇒a+b+c=84
(a+b):2=35⇒a+b=70
din ultimele doua relatii⇒c=84-70⇒c=14
Ex 10
a+b=41.1
a-b=32.4
adunam cele doua relatii
⇒ 2a=73.5
⇒a=36.75
⇒b=41.1-36.75
⇒b=4.35
