试卷更新日期:2019-02-27 类型:同步测试
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13 - 16 = 47 + 17 = 56 - 16 = 815 - 13 =
25 + 14 = 37 - 29 = 34 - 25 = 12 + 56 =
12+13 =
12−13 =
13+14 =
13−14 =
14+15 =
14−15 =
规律:
12+14 =
12−14 =
13+16 =
13−16 =
12+18 =
12−18 =