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1、20以内的退位减法,5,圈一圈，算一算。,10-9=1；1+()=()。,9+()=12；12-9=()。,3,还可以怎样计算？,3,3,2,3,树上原来有14只小鸟，,飞走了9只小鸟。,原来有1个松果，小松鼠搬走了9 个。,14-9=5（只）,15-9=6（个）,11 9=2,12 9=3,13 9=4,14 9=5,15 9=6,16 9=7,17 9=8,18 9=9,11 9=212 9=313 9=414 9=515 9=616 9=717 9=818 9=9,139,8,3,7,5,2,4,6,159,149,189,179,129,119,169,139,8,3,7,5,2,4,
2、6,159,149,189,179,129,119,169,139,8,3,7,5,2,4,6,159,149,189,179,129,119,169,8,3,7,5,2,4,6,159,149,189,179,129,119,169,139,8,3,7,5,2,4,6,159,149,189,179,129,119,169,139,8,3,7,5,2,4,6,159,149,189,179,129,119,169,139,8,3,7,5,2,4,6,159,149,189,179,129,119,169,139,8,3,7,5,2,4,6,159,149,189,179,129,119,169,139,8,3,7,5,2,4,6,159,149,189,179,129,119,169,139,8,3,7,5,2,4,6,159,149,179,129,119,169,139,189,
