问题标题：
时间单位转换一写初二上学期的时间单位转换要用科学记数法的用科学记数法(1)2min=__________=____h(2)2h=__________=____min2h=__________=____s(3)30min=__________=____h30min=__________=____s(4)45min=__________=____h(5)120s=
问题描述：
时间单位转换
一写初二上学期的时间单位转换要用科学记数法的用科学记数法
(1)2min=__________=____h
(2)2h=__________=____min
2h=__________=____s
(3)30min=__________=____h
30min=__________=____s
(4)45min=__________=____h
(5)120s=__________=____min
120s=__________=____h
(6)1800s=__________=____h
何骥回答：
(1)2min=2/60h=1/30h
(2)2h=2*60min=120min
2h=2*3600s=7200s
(3)30min=30/60h=0.5h
30min=30*60s=1800s
(4)45min=45/60h=0.75h
(5)120s=120/60min=2min
120s=120/3600h=1/30h
(6)1800s=1800/3600h=0.5h
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