(1)0.5吨:25千克,
=500千克:25千克,
=500÷25,
=20;
(2)0.8米:40分米,
=8分米:40分米,
=8÷40,
=
1
5 ;
(2)15分:0.2时,
=15分:12分,
=15÷12,
5
4 .