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Daca P ∈ [AB] astfel incat AP/AB=2/5  si PB=1cm atunci lungimea segmentului [AB] este egala cu.......cm.
Multumesc anticipat.


Răspuns :

AP/AB=2/5    ⇒     2AB=3AP⇒    AB=3AP/2
AP+PB=AB
AP+1=3AP/2
AP-3AP/2=-1
(2AP-3AP)/2=-1
-AP=-1X2
-AP=-2        (-1)
AP=2cm
AB=AP+PB=2cm+1cm=3cm