“小华2.5小时走了5千米”,用“2.5÷5”是求 ,用“5÷2.5”是求 .
5÷ =1.25== :28.
60%= :15== ÷20= (写小数)
:10=18: =50%=6: = ÷60.
35: =20÷16== %= (填小数)
:3=10: ==1.5: .