专题文章
时长:00:00更新时间:2024-12-06 20:18:46
1.1 + 5 = 6,5 + 1 = 6。2.2 + 4 = 6,4 + 2 = 6。3.3 + 3 = 6。4.7 - 1 = 6。5.8 - 2 = 6。6.9 - 3 = 6。二、得数是7的加减法。1.1 + 6 = 7,6 + 1 = 7。2.2 + 5 = 7,5 + 2 = 7。3.3 + 4 = 7,4 + 3 = 7。4.8 - 1 = 7。5.9 - 2 = 7。6.10 - 3 = 7。三、6和7的定义;
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