问题 解答题 算一算、填一填42km2=______m23600t=______kg7200dm=______m25L+7000ml=______L6305kg=6t+______kg312+712=______1-59=______1115-515+615=______. 答案 42km2=42000000m23600t=3600000kg7200dm=720m25L+7000ml=32L6305kg=6t+305kg312+712=561-59=491115-515+615=45.故答案为:42000000;3600000;720;32;305;56;49;45.