Răspunsuri

2014-04-03T13:37:55+03:00
(a+b)/2=2.8
a+b=5.6

(a+c)/2=3.5
a+c=7 = > a=7-c

(b+c)/2=3.9
b+c=7.8 => b=7.8-c

a+b=5.6
7-c+7.8-c=5.6
7+7.8-5.6=c+c
9.2=2xc
c=4.6

a=7- 4.6
a=2.4

b=7.8-4.6
b=3.2