＝{#blank#}1{#/blank#}     ＝{#blank#}2{#/blank#}

＝{#blank#}3{#/blank#}     ＝{#blank#}4{#/blank#}

4.5÷1.01{#blank#}1{#/blank#}4.5           270×0.999{#blank#}2{#/blank#}270×1.002

1.25÷0.08{#blank#}3{#/blank#}125÷8      {#blank#}4{#/blank#}

①2.7×1.5＝{#blank#}1{#/blank#}．

②270×1.5＝{#blank#}2{#/blank#}．

③40.5÷1.5＝{#blank#}3{#/blank#}．

④0.405÷1.5＝{#blank#}4{#/blank#}．

2.4÷0.2{#blank#}1{#/blank#}2.4               32.8÷0.25{#blank#}2{#/blank#}32.8×4

9.2×1.1{#blank#}3{#/blank#}9.2÷1.1        1.56{#blank#}4{#/blank#}1.56×0.28

4.5×3.6={#blank#}1{#/blank#}      162÷3.6={#blank#}2{#/blank#}