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

 {#blank#}7{#/blank#}－{#blank#}8{#/blank#}＝{#blank#}9{#/blank#}     {#blank#}10{#/blank#}－{#blank#}11{#/blank#}＝{#blank#}12{#/blank#}

某商店售货情况如下：

12 – 7 =        12 – 4 =        12 – 9 =       12 – 6 =

13 – 5 =        13 – 9 =        13 – 7 =       13 – 4 =

{#blank#}1{#/blank#}＋6＝10       9＋{#blank#}2{#/blank#}＝15       5＋{#blank#}3{#/blank#}＝15

{#blank#}4{#/blank#}＋10＝12      7＋{#blank#}5{#/blank#}＝13       8＋{#blank#}6{#/blank#}＝16