口算6+9= 17+4= 14-5= 12-4= 16-7= 3-6= 8+5= 15-8

口算6+9= 17+4= 14-5= 12-4= 16-7= 3-6= 8+5= 15-8=
2025-01-24 05:38:09
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回答1:

解:
6+9=15,

17+4=21,

14-5=9,

12-4=8,
16-7=9, 3-6=-3, 8+5=13, 15-8=7,