加减法
8-3= 8+4= 7+1= 4+2= 6-2=
1+2= 9-1= 9+2= 6+4= 3+1=
8-3= 1+2= 9-1= 9+2= 16–5=
13-5= 9-7= 2+5= 8+3= 12-2=
11+2= 8+9= 5+6= 5+3= 4+0=
9+3= 11-2= 13+2= 8+7= 4+6=
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加减法
8-3= 8+4= 7+1= 4+2= 6-2=
1+2= 9-1= 9+2= 6+4= 3+1=
8-3= 1+2= 9-1= 9+2= 16–5=
13-5= 9-7= 2+5= 8+3= 12-2=
11+2= 8+9= 5+6= 5+3= 4+0=
9+3= 11-2= 13+2= 8+7= 4+6=
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