zamiana jednostek   1sekunda = ......... h 20 dm2 =.............mm2

a) 1 godzina zawiera 3600s, a więc: 1s= 1/3600 h   b) 1 (dm^2) = 10 000 mm^2 a więc: 20dm^2 =200 000 mm^2   PS Liczę na naj :)

1h=60min 1h=60*60 s=3600s   s=1/3600 h [latex]sapprox2,8 imes10^{-4}h[/latex]   1dm=10*10mm=100mm 1dm2=(100mm)^2=10000mm^2   1dm^2=10000mm^2 20dm^2=x   x=200000mm^2    1sekunda = 2,8*10^-4 h 20 dm2 = 200000 mm2