答案见图片
(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
我实在想不出。。这种题还要怎么写过程？。
二点三乘以十的负六次方
能给个采纳吗？谢谢哦
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