比 少4个．

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

3＋4＋{#blank#}1{#/blank#}= 9            {#blank#}2{#/blank#}＋5＋2=8          8－{#blank#}3{#/blank#}－1=6

9－3－{#blank#}4{#/blank#}=1            5＋{#blank#}5{#/blank#}＋4=10          10－{#blank#}6{#/blank#}－5=0

{#blank#}7{#/blank#}＋ 6 =4 ＋{#blank#}8{#/blank#}         10 － 6 = {#blank#}9{#/blank#} －{#blank#}10{#/blank#}   {#blank#}11{#/blank#}＋ 3 = 9 ＋{#blank#}12{#/blank#}

10-3{#blank#}1{#/blank#}7       9-4{#blank#}2{#/blank#}5        10-8{#blank#}3{#/blank#}4

4+5{#blank#}4{#/blank#}8        7-2{#blank#}5{#/blank#}8         2+6{#blank#}6{#/blank#}8

7-1{#blank#}7{#/blank#}5        6+3{#blank#}8{#/blank#}3         9-3{#blank#}9{#/blank#}7

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