①x+4x=15.5
②12(x+5.6)=156
③ :9= :x
135+398= 0.14×50= 3﹣2÷7=
48×12.5%= 1.25×9×8= ﹣ =
7× ÷7× = ÷ =
x:0.35=0.6:0.2