Răspunsuri

2014-04-17T11:18:15+03:00
Notam nr cu x.
( 6x + 15 ) : 2 - 11,12 = 3,88.
( 6x +15 ) : 2 = 15 / · 2
6x + 15 = 30
6x = 15 / 6
x = 2,5
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2014-04-17T11:20:37+03:00
{[(a*6)+15]:2}-11,12=3,88
{[(a*6)+15]:2}=3,88+11,12
[(a*6)+15]:2=15
(a*6)+15=15*2
(a*6)+15=30
a*6=30-15
a*6=15
a=15:6.. => a=2,5

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