3吨50千克=吨
1.2时=时 分
1700毫升=升
540dm2=m2=cm2
135+398= 0.14×50= 3﹣2÷7=
48×12.5%= 1.25×9×8= ﹣ =
7× ÷7× = ÷ =
A.(1,1)
B.(3,1)
C.(3,2)