问题:
算式:
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9+2= 9+9= 9+5= 9+3=
11-9= 18-9= 14-9= 12-9=
11-9+2= 18-9+4= 14-9+5= 12-9-2=
11-9-1= 18-9-2= 14-9-5= 12-9+2=