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

二四{#blank#}1{#/blank#}   算式：{#blank#}2{#/blank#} 或{#blank#}3{#/blank#}

{#blank#}1{#/blank#}十二      {#blank#}2{#/blank#}二十       {#blank#}3{#/blank#}二十四

3×4{#blank#}1{#/blank#}4×5         16＋20{#blank#}2{#/blank#}35

2×2{#blank#}3{#/blank#}2＋2         2×8＋8{#blank#}4{#/blank#}8×3－8

36+2＝     5×3＝       4×4＝        1×6＝

4×5＝     56+34＝      100-58＝      47-28＝

56-28＝    80-54＝      2×7＝        3×6＝

5×5＝        2×6-6＝          46-37+24＝