Question

2. Exprimă următoarele arii in S.I.
a. A = 450 cm2
b. A = 7200 dm2
c. A = 0,006 dam2
d. A = 9250 mm2
e. A =0,3 hm2
f. A = 2,5 km2
g. A = 25 ari
h. A = 0,85 ha
3. Exprimă următoarele volume in S.I.
a. V = 25 L
b. V = 250 dm3
c. V = 8200 cm3
d. V = 51 dam3
e. V = 15 400 000 dm3
f. V = 0,00075 km3
g. V = 0,8 hm3
h. V = 105 000 000 mm3
i. V = 4520 hL
j. V = 6500 dL dm3
4. Exprimă urmatoarele durate in S.I.
a. t = 4200 ms
b. t =95 000 ms
c. t = 1,5 h
d. t = 25 min
e. t = 1h 35 min
f. t = 1zi 7h 15min
g. t = 100min 50s
h. t = 1 săptamână



Dau Coroana!!!

Answer 1

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