Răspunsuri

2014-02-06T17:11:59+02:00
 \frac{AB}{DF} = \frac{AC}{DE} AC= \frac{ABXDE}{DF} = \frac{18X12}{10} =21,6
 \frac{AB}{DF} = \frac{BC}{FE} BC= \frac{ABXFE}{DF} = \frac{18X16}{10} =28,8
Sper sa fie corect:) .
1 5 1
2014-02-06T17:16:08+02:00
Tr ABC asemenea cu tr DEF -> AB/DE=AC/DF=BC/EF echivalent cu 18/12=AC/10=BC/EF
luam primul raport 18/12=AC/10 -> AC=18*10 supra 12=15 AC=15
luam al 2lea raport18/12=BC/EF adica 3/2=BC/EF-> BC=3 si EF=2