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P=k:r / *r
Pr=k / :p
r =k:p
odp.C
zad 2
n=0,8b /*10 (moja metoda)
10n=8b /:8
1.25n=b
b=1.25n
odp.B
zad 3
P=(a*h):2
P=0.5a*0.5h /*2
2P=a*h /:a
2P:a=h
h=2P:a
Odp D