题目内容
口算.
8
口算
4+14= 68-8= 59+6=
11-2= 17-8= 14-6= 11-5= 16-9=
7+9= 14-7= 13-5= 7+6= 8+3=
40+5= 67-7= 14-8= 54-4= 8+20=