a: \(4987m^2=49dam^287m^2\)
\(125600m^2=1256dam^2=12hm^256dam^2\)
\(320060dam^2=32\operatorname{km}^26000m^2\)
\(9028007m^2=9\operatorname{km}^228007m^2\)
c: \(5m^216dm^2=5,16m^2\)
\(7m^25\operatorname{cm}^2=7,0005m^2\)
\(68m^2=68m^2\)
\(693000m^2=69,3hm^2=69,3ha\)
\(0,235\operatorname{km}^2=23,5ha\)
\(25m^227dm^2=25,27m^2\)
\(15\operatorname{km}^2268hm^2=17,68\operatorname{km}^2\)
\(2002\operatorname{cm}^2=0,2002m^2\)
\(500m^2=0,05ha\)
\(0,058\operatorname{km}^2=5,8ha\)
\(9\operatorname{km}^226dam^2=9,0026\operatorname{km}^2\)
\(75m^227dm^2=75,27m^2\)

4 và 5