1 ) b-> kg
2) a) adevărat ; b -> fals ' c -> 3min = 180sec . (A)
3) 7.59dm= 759 mm
4) 305m²=3,05 dam²
5)712dl = 7,12 dal
6) L = 9dm , l = 6 dm
P = 2 ( L + l ) = 2 ( 9 + 6 ) = 2 * 15 = 30 dm
7) P = 4l => 22=4l => l = 5,5 m
A = l² = (5,5)² = 30,25 m ²
8) V cub = l³ ; 27 = l³ => l = 3 dm .
cubul are 12 muchii congtuente => S = 12*3 = 36 dm .
9) l = l
L = l + 1
h = l + 2
P = 4l + 4L + 4h
P = 4l + 4 ( l + 1 ) + 4 ( l + 2 )
84 = 4l + 4l + 4 + 4l + 8
72 = 12l
l = 72 : 12
l = 6 .
L = 6 + 1
L = 7
h= 6 + 2
h = 8
V = l * L * h = 6*7*8 = 336 m³
