一年级数学(上册)凑十法练习题.
9 + 6 = 9 + 5 = 9 + 4 = 9 + 3 = 9 + 2 = 9 + 7 = 9 + 8 = 9 + 9 = 8 8 + 7 = 8 + 9 = 8 + 6 = 8 + 5 = 8 + 4 = 8 + 3 = 7 + 9 = 7 + 8 = 7 + 7 + 6 = 7 + 4 = 7 + 5 = 6 + 9 = 6 + 8 = 6 + 7 = + 8 = 7 =
6 + 6 = 6 + 5 = 5 + 9 = 5 + 8 = 5 + 7 = 5 + 6 = 4 + 9 = 4 + 8 = 4 + 7 = 3 + 9 = 3 + 8 = 2 + 9 =
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