买3千克要{#blank#}1{#/blank#}元．

买1.2千克要{#blank#}2{#/blank#}元．

买0.8千克要{#blank#}3{#/blank#}元

23.2×0.9{#blank#}1{#/blank#}0.9          15.6×3.2{#blank#}2{#/blank#}3.2×15.6

1×0.36{#blank#}3{#/blank#}1               3.6×5.2{#blank#}4{#/blank#}52×0.36

7.68×0.98{#blank#}1{#/blank#}7.68    7.68×1.98{#blank#}2{#/blank#}7.68    7.68×0.98{#blank#}3{#/blank#}7.68÷0.98

3.68×0{#blank#}4{#/blank#}3.68         7.6÷1.02{#blank#}5{#/blank#}7.6       7.68×1.5{#blank#}6{#/blank#}7.68÷1.5

①0.72×5 =

②2.4×0.8 =

③0.56×0.04 =

④19.4÷12≈（得数保留两位小数）

⑤400÷75 =（用循环小数表示结果）