Question

Calculați:
Calculați, exprimând rezultatele în S.I.:
a) 4 h 30 min + 2 h 55 min = ......................................................................
b) 1 h 4 min 20 s + 6 h 59 min 33 s = .........................................................
c) 22 h 25 min – 18 h 38 min = ..................................................................
d) 0,003 km2 + 46078 dm2 = .........................................................

Answer 1

[ t ]SI=s

a)4h30min+2h55min=6h85min=7h25min=

=7×3600s+25×60s=25200s+1500s=26700s

b)1h4min20s+6h59min33s=7h63min53s=

8h3min53s=8×3600s+3×60s+53s=

=28800s+180s+53s=29033s

c)22h25min-18h38min=3h47min=

=3×3600s+47×60s=10800s+2820s=

=13620s

[A]SI=m2

d)0,003km2+46078dm2=3000m2+460,78m2=

=3460.78m2