Răspuns:
Explicație pas cu pas:
a) 2 × 13 cm + 5 × 6 cm + 123 cm = 26 cm + 30 cm + 123 cm = 179 cm
b) 10 × 153 dm + 1 400 000 mm : 100 = 153 m + 14 000 mm =
= 153 m + 14 m = 167 m
c) 1,2 km - 2,8 dam = (1,2×100) dam - 2,8 dam = 120 dam - 2,8 dam =
= 117,2 dam = ( 117,2 × 1000 ) cm = 117 200 cm
d) 5000 mm + 1 200 cm - 70 dm = 5 m + 12 m - 7 m = 17 m -7 m = 10 m
e) 43 000 mm - 210 dm = 43 m - 21 m = 22 m
f) 5 900 cm - 14 m - 3 000 mm = 59 m - 14 m - 3 m = 45 m - 3 m = 42 m
g) 4 × 10⁶ cm - 18 hm = ( 4 x 10⁶ : 10⁵) km - (18 : 10) km = 40 km - 1,8 km =
= 38,2 km
