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,复习,14-6=,14-8=,11-6=,13-7=,16-7=,18-9=,15-6=,14-9=,12-5=,13-6=,12-8=,14-7=,15-7=,18-8=,17-9=,13-5=,帮小鸟找找家,看谁都能算对.,12-4= 13-6= 11-2=15-6= 14-5= 13-5=11-3= 12-3= 12-6=14-6= 13-4= 11-5=12-5= 11-6= 12-4=,8,7,9,9,9,8,8,9,6,8,9,6,7,5,8,8,8,4,8,你准行!,找规律填一填,找规律验证,20以内退位减法表,竖着看，减法算式是怎样排列的？横着看呢,看谁都能算对.,13-9= 15-8= 18-9=16-7= 16-9= 14-7=12-3= 14-5= 12-5=11-8= 15-6= 13-4=17-9= 11-7= 11-2=,4,7,9,9,7,7,9,9,7,3,9,9,8,4,9,8,8,9,9,+,17,17,17,17,8,8,9,9,3,5,10,11,13,9,8,12,3,11,12,6,13,5,13,5,11,2,5,14,11,8,14,8,6,8,+,7,15,11,5,6,9,1,6,7,8,3,
