* * 4 + 3 7 5 - 2 = 4 - 1 + 2 = 4 - 1 + 2 = 3 4 - 1 + 2 = 3 4 - 1 + 2 = 3 2 + 6 - 3 = 做一做 7 - 3 + 4 = 4 + 3 - 2 = 7 5 4 - 2 + 3 = 2 5 6 + 3 - 4 = 9 5
加减溷合.ppt
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* * 4 + 3 7 5 - 2 = 4 - 1 + 2 = 4 - 1 + 2 = 3 4 - 1 + 2 = 3 4 - 1 + 2 = 3 2 + 6 - 3 = 做一做 7 - 3 + 4 = 4 + 3 - 2 = 7 5 4 - 2 + 3 = 2 5 6 + 3 - 4 = 9 5
加减溷合.ppt