2026年天天练口算一年级数学下册人教版第30页答案
12
选数填空
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20-6=

15-8=
12-8=
18-9=
16-8=
15-7=
17-8=
17-9=
14-5=
15-9=
16-7=
14-9=
13-6=
12-7=
15-6=
14-7=
13-9=
14-6=
20-8=
16-9=
13-7=
13-5=
13-4=
12-5=
19-9=
14-8=
13-8=

答案

14；7；4；9；8；8；9；8；9；6；9；5；7；5；9；7；4；8；12；7；6；8；9；7；10；6；5

解析

根据20以内退位减法的计算方法（想加算减法或破十法）依次计算各算式结果。