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

1.45{#blank#}1{#/blank#}10.45           45厘米{#blank#}2{#/blank#} 0.5米     0.3{#blank#}3{#/blank#}0.24

8厘米{#blank#}4{#/blank#}0.18米        520分{#blank#}5{#/blank#} 5.2元      0.90元{#blank#}6{#/blank#} 8.20角

6.08{#blank#}1{#/blank#}6.8          8.5×0.8{#blank#}2{#/blank#}8.5

4.8×1.3{#blank#}3{#/blank#}4.8      5.4×2{#blank#}4{#/blank#}54×0.2