11-2＝{#blank#}1{#/blank#}

12－2＝{#blank#}2{#/blank#}

13-3＝{#blank#}3{#/blank#}

5＋10＝{#blank#}4{#/blank#}

11－4＝{#blank#}5{#/blank#}

12－3＝{#blank#}6{#/blank#}

12-5＝{#blank#}7{#/blank#}

14－5＝{#blank#}8{#/blank#}

13－4＝{#blank#}9{#/blank#}

15只小鸭去游泳，又来了8只，游走了14只，河里还有几只？

7+9=         10-4=         14-3=         5+6=         15-10=

4+14=         8+8=         19-8=         6+10=         3+7=

16-3=         7+8=         2+3=         18-5=         15-4=

5+5-5=       9-2+8=       9+9-3=       2+7+4=       3+6+7=

 ☆     

{#blank#}1{#/blank#} ☆{#blank#}2{#/blank#}