a) AB=0,5dam=a
BC=30dm=b
AC=4,2m=c
0,5dam=5m
30dm,=0,3m
Pt=a+b+c
Pt=5m+0,3m+42m
Pt=9,5m
b) AB=4cm=a
BC=2x4cm=b
AC=BC-2=c
BC=2x4=8cm
AC=8-2=6cm
Pt=a+b+c
Pt=4+8+6=18cm
c) AB=10m=a
BC=10:2m=b
AC=BC+2500mm=c
BC=10:2=5m
AC=5+2500=5+2,5=7,5m
Pt=a+b+c
Pt=10+5+7,5=13,5m
d) AB=36dam=a
BC=7/5xAB=b
AC=1/2x(AB+BC)=c
BC=7/5x36=7x36/5=252/5=5,4dm
AC=1/2x(36+5,4)=1/2x41,4=1x41,4/2=20,7dm
Sper ca te-am ajutat și,, /" înseamnă fractie pe