Răspuns:
[tex](a)\boldsymbol{ \red{72 \ m}}; \ (b)\boldsymbol{ \red{48 \ m}}; \ (c) \boldsymbol{ \red{280 \ m}}[/tex]
Rezolvare:
a) 1,8 dam = 1,8 · 10 m = 18 m
240 dm = 240 : 10 m = 24 m
3·10⁴ mm = 3·10⁴ : 10³ m = 3·10 = 30 m
[tex]P = 18 + 24 + 30 = \bf 72 \ m[/tex]
b) 20% din 0,06 km = (20/100) · 0,06 · 1000 m = (20/100) · 60 = 12 m
[tex]P = 4 \cdot \ell = 4 \cdot 12 = \bf 48 \ m[/tex]
c) L = 0,08 km = 0,08 · 1000 m = 80 m
l = 3/4 din L = (3/4) · 80 = 60 m
[tex]P = 2 \cdot(L + \ell) = 2 \cdot (80 + 60) = \bf 280 \ m[/tex]
