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

8+4＝12   {#blank#}2{#/blank#}＋{#blank#}3{#/blank#}＝{#blank#}4{#/blank#}

5＋8{#blank#}1{#/blank#}14

8＋9{#blank#}2{#/blank#}12

4＋9{#blank#}3{#/blank#}16

3+{#blank#}1{#/blank#}＝7       {#blank#}2{#/blank#}+5＝5      {#blank#}3{#/blank#}+3＝9        6+{#blank#}4{#/blank#}＝18

11{#blank#}1{#/blank#}12       9+6{#blank#}2{#/blank#}7+6      10-4{#blank#}3{#/blank#}3+3

17-7{#blank#}4{#/blank#}7     9-5{#blank#}5{#/blank#}8-5         9+3{#blank#}6{#/blank#}5+8