14-6= 15-9=
14-7= 17-9=
不计算，按你发现的规律比一比。
13-413-7 12-611-6
13-7={#blank#}3{#/blank#} 16-7={#blank#}4{#/blank#}
14-8={#blank#}5{#/blank#} 17-8={#blank#}6{#/blank#}
按你发现的规律写算式。{#blank#}7{#/blank#}
11-4=
16-9 {#blank#}1{#/blank#}6 11-4 {#blank#}2{#/blank#}7
12-4 {#blank#}3{#/blank#}13-5 13-7 {#blank#}4{#/blank#}13-6
15-7 {#blank#}5{#/blank#}14-8 16-8 {#blank#}6{#/blank#}17-8
