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(5*4)+(4*5/2)+(3,14*2^2)=20+10+12,56=42,56
19.
3,14*[(1/2*10)^2]=3,14*25=78,5
4*(4*1)=4*4=16
78,5-16=62,5
12.
a)
P=4*2=8
Obw=4+4+3+3=14
b)
P=2*2=4
Obw=4*2=8
c)
P=5*4=20
Obw=4*5=20
d)
P=2,5*1,5=3,75
Obw=2,5+2,5+1,5+1,5=8
e)
P=8*3/2=12
Obw=2*5+8=18
f)
P=(3+7)*3/2=15
Obw=3+7+3+5=18