①30S=( )=( )min ②0.2h=( )=( )S ③45min=( )=( )h ④500m=( )=( )mm
请帮忙``急用`!
参考答案:①30s=(30/60min )=(0.5 )min
②0.2h=( 0.2*3600S)=(720)s
③45min=(45/60h )=(0.75 )h
④500m=( 500*1000mm)=(500000)mm
请帮忙``急用`!
参考答案:①30s=(30/60min )=(0.5 )min
②0.2h=( 0.2*3600S)=(720)s
③45min=(45/60h )=(0.75 )h
④500m=( 500*1000mm)=(500000)mm