题目

细心算一算 12-7=        14-6=          8+5=         11-4= 18-9=        4+9=           16-7=        14-7= 13-6=        15-8=          11-5=        9+5= 11-2=        12-3=          13-4=        16-9= 答案：12-7=5        14-6=8          8+5=13         11-4=7 18-9=9        4+9=13           16-7=9        14-7=7 13-6=7        15-8=7          11-5=6        9+5=14 11-2=9        12-8=4          13-4=9        16-9=7

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