Odpowiedź:
2. 25 a; 0,25 ha
3. 160 l
4. 31/10
Szczegółowe wyjaśnienie:
2. 2500 m^2 = 25 • 100 m^2 = 25 • 1 a = 25 a
2500 m^2 = 0,25 • 1000 m^2 = 0,25 • 1 ha = 0,25 ha
3. a = 40 cm = 4 dm
b= 80cm = 8dm
c = 50cm = 5dm
V = a•b•c
V = 4•8•5
V = 160dm³
160dm³ = 160l
4. 4 - 9/4 : 9/5 + 11/4 - 8/3 • 9/10 = 4 - 9/4 • 5/9 + 11/4 - 4 • 3/5 = 4 - 1/4 • 5 + 11/4 - 12/5 = 4 - 5/4 + 11/4 - 12/5 = 4 + 6/4 - 12/5 = 4 + 30/20 - 48/20 = 80/20 + 30/20 - 48/20 = 110/20 - 48/20 = 62/20 = 31/10
