3.21×23＝{#blank#}1{#/blank#}              3.21×2.3＝{#blank#}2{#/blank#}           32.1×2.3＝{#blank#}3{#/blank#}

32.1×0.23＝{#blank#}4{#/blank#}            3.21×0.23＝{#blank#}5{#/blank#}           321×0.023＝{#blank#}6{#/blank#}

  {#blank#}1{#/blank#}             5.6×100{#blank#}2{#/blank#}5.6÷0.01

8.93×1.055{#blank#}3{#/blank#}8.93           7.18×0.37{#blank#}4{#/blank#}7.18

9.87+2.3=            22-12.35=    (需要验算)

5.9×0.89=        41.5÷7.5≈     (结果保留一位小数)