买2千克{#blank#}1{#/blank#}元，买2.5千克{#blank#}2{#/blank#}元，买0.8千克{#blank#}3{#/blank#}元.

0.6÷15={#blank#}1{#/blank#}

1－0.48={#blank#}2{#/blank#}

2.4×0.4={#blank#}3{#/blank#}

2.1×7={#blank#}4{#/blank#}

570×16               5.7×160

0.057×1600        57×1600

57×16                 5.7×16

0.57×160000      57×160

2×0.48=      0.81÷3=      0.5×2.4=      4×0.24=    

3.2÷0.4=     0.05×20=     8.2÷0.01=     2.5×4=    

70.9×{#blank#}1{#/blank#} =46.085      {#blank#}2{#/blank#}×{#blank#}3{#/blank#}=4608.5