2.3+5.6={#blank#}1{#/blank#}       {#blank#}2{#/blank#}      {#blank#}3{#/blank#}

  {#blank#}4{#/blank#}      {#blank#}5{#/blank#}

 {#blank#}6{#/blank#}     {#blank#}7{#/blank#}

①18÷0.36÷1.25
②6.39+0.175÷0.25
③5.4÷(27×0.4)
④(5.2－1.6)÷0.8

①503+197=             ② ×15=        ③0.8+ =       ④3.6×25%=

⑤ + × =       ⑥ ÷ =      ⑦8.01-2.1=      ⑧ × =

⑨47.8÷5.9≈                     ⑩12.5×8÷12.5×8=

13.25÷2.5÷0.4               （15.6－2.8）÷0.4                    4.8÷0.4－2.1÷21