Răspuns:
1.
a) 23 dm = 230cm;
b) 5.2m = 520 cm;
c) 7.35 dam = 7350cm;
d) 400mm= 40cm;
2.
a) 19dm = 190cm > 180cm;
b) 7.2hm = 720m=720m;
c) 3.5 km= 35000 m= 35000m.
3.
[tex]a)18m^{2} = 1800dm^{2} ;\\b)2.5m^{2} =25000^{2} ; \\c)5 ari= 500m^{2} ; \\d)4.3ha^{2}= 43000^{2} ;\\e)4000mm^{2} =0.4dm^{2} ; \\f)230cm^{2} =0.023m^{2}[/tex]
4. Aria dreptunghi = L*l
4m= 400cm
Aria dreptunghi=400*25= 10000[tex]cm^{2}[/tex]
5. 2dm= 20cm; 500mm= 50cm.
Volum= L*l*h = 40*20*50= 40000cm (cubi)= 400m (cubi- la puterea 3).
6. L= 800 m= 80 dam
Aria drept= L*l= 160[tex]dam^{2}[/tex]
l= [tex]\frac{160}{80}[/tex] = 2 dam;
Perimetrul = 2L+2l= 160+4= 164 dam.
Explicație pas cu pas:
