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4b+24cm=64cm
4b=64-24
b=40/4
b=10
a=10+12=22
P=a*b=12*10=120cm2
ćw2
a*3a=0,48
3a2=0,48
a2=48/3
a2=16
a=4
4*3=12
Obw.2*4+2*12=8+24=32cm=0,32dm