8.5×1.12={#blank#}1{#/blank#}   85×11.2={#blank#}2{#/blank#}

0.85×112={#blank#}3{#/blank#}  85×112={#blank#}4{#/blank#}

3.5×0.9{#blank#}1{#/blank#}3.5           0.46×1{#blank#}2{#/blank#}0.46          5.83{#blank#}3{#/blank#}1.01×5.83

2.7×0.9{#blank#}4{#/blank#}2.7×1.01     5.2×10{#blank#}5{#/blank#}5.2÷10        0.99{#blank#}6{#/blank#}0.99×0.99

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

从上面选择一道小题，我思考的过程或解答的依据是{#blank#}4{#/blank#}．