看谁算得又快又准。9-2= 6+2= 5+3=5+2= 3+7= 10-10=
8-2= 6+2= 8-6=
6-3= 3+3= 7-5= 5+2=
9-4= 9-5= 4+5=
10-4= 10-6= 4+6=
5+2= 7-5= 7-2=