5.78÷1.9≈{#blank#}1{#/blank#}(得数保留三位小数)

3.12÷13={#blank#}1{#/blank#}        3.12÷1.3={#blank#}2{#/blank#}       312÷13={#blank#}3{#/blank#}

0.312÷13={#blank#}4{#/blank#}       312÷130={#blank#}5{#/blank#}      3.12÷0.13={#blank#}6{#/blank#}

4.52+6.48=       18.25-8.18=         12×0.5=

9.3÷0.01=          0.81÷9=              7×0.4÷7×0.4=

1.25×0.8＝      0.9÷0.01＝      0.4×0.02＝

16÷1.6＝        0.63÷0.9＝      1.8×0.1＝

0.5×0.60.3×0.1         1.5÷0.91.5

2.5×0.852.5            7.35×55.35×7

46.8÷1.24.68÷0.12

0.75÷0.37.5÷2.5