Răspuns:
2In S.I. aria se exprima in m²:
a)A=450 cm²=450:10000=0,045 m²
b)A=7200dm²=7200:100=72m²
c)A=0,006 dam²=0,006•100=0,6m²
d)A=9250 mm²=9250:1000000=0,00925 m²
e)A=0,3hm²=0,3•10000=3000m²
f)A=2,5km²=2,5•1000000=2500000m²
g)A=25 ari=25 dam²=25•100=2500 m²
h)A=0,85 ha=0,85hm²=0,85•10000=8500m²
3.In S.I. volumul se exprima in m³:
a)V=25L=25dm³=25:1000=0,025m³
b)V=250dm³=250:100=0,25 m³
c)V=8200cm³=82:1000000=0,000082m³
d)V=51dam³=51•1000=51000m³
e)V= 15 400 000 dm³= 15 400 000:1000=15400m³
f)V = 0,00075 km³=0,00075•1 000 000 000=750000m³
g)V=0,8 hm³=0,8•1 000 000=800 000m³
h)V= 105 000 000 mm³= 105 000 000:1 000 000 000 =0,105m³
i)V=4250 hL aici poti folosi faptul ca 1m³=10hL=>4250hL=425 m³
j)V=6500 dL=650L=650dm³=650:1000=0,65m³
4.In S.I timpul se exprima in secunde:
a)t=4200ms=4200:1000=0,42s
b)t=95000ms =95000:1000=95s
c)t=1,5h =1,5•3600=5400 s
d)t=25 min=25•60=1500 s
e)t=1h 35min =1•3600+35•60=3600+ 2100=5700s
f)t=1 zi 7h 15 min=24h+7h+15•60=31•3600+900=111 600+900= 112 500 s
g)t=100min 50 s=100•60+50=6000+50=6050s
t=o saptamana =7•24 h=168 h=168•3600 s =604800s
