和是8、9加法与相应减法.ppt
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* 图上画着什么?你能写出哪些算式? 6 + 2 = 8 2 + 6 = 8 8 - 2 = 6 8 - 6 = 2 摆一摆 7 + 2 = 2 + 7 = 9 9 9 - 2 = 9 - 7 = 7 2 5 + 3 = 8 - 3 = 8 5 3 + 5 = 8 - 5 = 8 3 摆一摆 8 5 8 3 试一试 8 2 6 8 6 8 6 2 想想做做 9 9 8 1 *
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