2.4+5.7{#blank#}1{#/blank#}5.7+2.4       52.1+72.1-43.65{#blank#}2{#/blank#}43.65+(72.1-52.1)

12.34-2.9{#blank#}3{#/blank#}5.73+4.1    35.6+4.6+7.01{#blank#}4{#/blank#}35.6+4.4+7.21

①6.08元{#blank#}1{#/blank#}6元8分        {#blank#}2{#/blank#}          22×5{#blank#}3{#/blank#}12×5

② - {#blank#}4{#/blank#} -            1- {#blank#}5{#/blank#}1-       {#blank#}6{#/blank#}

③360÷4{#blank#}7{#/blank#}360÷9       4.90元{#blank#}8{#/blank#}4元9角

5.778 {#blank#}1{#/blank#}5.788                 100×4 {#blank#}2{#/blank#}125﹣25×4

990千克 {#blank#}3{#/blank#}0.99吨            192÷24 {#blank#}4{#/blank#}192÷6×4