\(345km^2-45m^2\times4\)
\(=345000000m^2-45m^2\times4\)
\(=345000000m^2-180m^2\)
\(=344999820m^2\)
\(3km^26m^2+726589m^2\)
\(=3000006m^2+726589m^2\)
\(=3726595m^2\)
345km2−45m2×4345km2−45m2×4
=345000000m2−45m2×4=345000000m2−45m2×4
=345000000m2−180m2=345000000m2−180m2
=344999820m2=344999820m2
3km26m2+726589m23km26m2+726589m2
=3000006m2+726589m2=3000006m2+726589m2
=3726595m2