Un cub are latura eg cu:

a)1 dm b)2 dm c)30 cm d)5 m e)600mm f)0,25 m

Calculati volumul cubului si apoi stabiliti cati litri de apa incapin cub(in fiecare caz in parte).

Ma puteri ajuta??


Răspuns :

V[tex]V_{cub}= l^{3}=l*l*l [/tex]
stim bine ca [tex] 1dm^{3}=un litru(l) [/tex]
a)1dm*1dm*1dm=[tex] 1dm^{3} [/tex]=un litru
b)2dm*2dm*2dm=[tex] 8dm^{3} [/tex]=8 litri
c)30 cm=30:10=3dm⇒3dm*3dm*3dm=[tex] 3^{3}dm= 9dm^{3} [/tex]=9 litri
d)5m*10=50 dm⇒50dm*50dm*50dm=[tex] 125000dm^{3} [/tex]=125000 litri
e)600 mm:100=6dm⇒6dm*6dm*6dm=[tex] 6^{3}dm= 216dm^{3} [/tex]=216 litri
f)0,25m*10=2,5dm⇒2,5dm*2,5dm*2,5dm=[tex]2,5^{3}dm=15,625dm^{3} [/tex]=15,625 litri.