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2014-10-29T19:06:02+02:00
Cel mai inteligent răspuns!
2014-10-29T19:08:32+02:00
(a+b)/2=13,4 => a+b=26,8
a-b=6,4 => a=6,4+b
6,4+ 2*b=26,8 => 2*b=26,8-6,4 => 2*b=10,4=> b=5,2
5,2+a=26,8=>a = 21,6