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Dau coroana si 15 puncte!!!
Punctele A,B si C sint coliniare in aceasta ordine.Aflati lungimea segmentului:
a) AB,daca AC=20 cm,BC =0,12dm;
b)AC,daca AB =9cm,BC=1,5dm;
c)BC,daca AB=1,4cm,AC=4,1 dm;
d)AC,daca AB=2BC=10,8cm.

Răspuns :

0.12 dm =12 cm ; 20cm +12cm =32 cm
1.5 dm =15 cm ; 9 cm+ 15 cm=24
4.1 dm =41 cm ;1.4 cm +41 cm =42.4 cm
10.8 cm +2cm = 12.8
a) AB=AC-BC
BC=0,12dm=1,2cm
AB=20-1,2=18,8cm

b)
AC=AB+BC
BC=1,5dm=15cm
AC=9+15=24cm

c)BC=AC-AB
AC=4,1dm=41 cm
BC=41-1,4=39,6 cm

d)
AC=AB+BC
AB=2BC=10,8 => BC=10,8\2=5,4 cm
AC=10,8+5,4=16,2 cm

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