2)
l = 9 => p = 4x9 = 36 cm
l = 4 => p = 4x4 = 16 cm
l = 3 => p = 4x3 = 12 cm
l = 2 => p = 4x2 = 8 cm
a) perimetrul creste
b) perimetrul scade
3)
(210 : 3) x 60 = 70 x 60 = 4200 batai/ora
4)
200 l .............. 8 g
x l ..............1000 g
x = 200x1000/8 = 25 000 litri
5)
300 m ............. 6 s
x m ............3600 s
x = 300x3600/6 = 180 000 m = 180 km
8)
5 z ........................ 12 m
3 z ...........................x m
x = 5x12/3 = 60/3 = 20 muncitori
10)
Daca 3 robinete pot umple o piscina in 8 ore in cat timp pot umple 4 robinete aceeasi piscina ?
