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2014-11-13T22:45:58+02:00
A---------------B-----C-----D
3AB=BD ⇒AB=BD:3
AB=AD-BD=1,2-BD

BD:3=1,2-BD
BD=1,2X3-3BD
BD+3BD-3,6
4BD=3,6
BD=3,6:4
BD=0,9


AB=1,2-BD=1,2-0,9=0,3
AB=0,3


BD=BC+CD SI CUM BC=CD
BD=2BC
0,9=2BC
BC=0,9:2
BC=0,45


AC=AB+BC=0,3+0,45=0,75

AC=0,75