直接写得数 - = - = + = 1 - = + = - =
7+2= 9-2= 7+3= 10-3=
公交车上有16个人，到站后下了7个人，公交车上还有几个人？
冰箱里有15罐饮料，喝掉了7罐，冰箱里还剩下几罐饮料？
8-2= 8-5= 18-6= 12-1= 7-5= 12-2=
17-5= 17-3= 17-2= 17-1= 17-6= 17-4=
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