* 图上画着什么?你能写出那些算式? 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 摆一摆 5 + 3 = 8 - 3 = 8 5 3 + 5 = 8 - 5 = 8 3 5+3=8,3+5就一定等于8吗? 5+3=3+5=8 7 + 1 = 8 8- 7 = 1 7+1=8,8-7=1 6 + 2 = 8 8- 6 = 8- 2 = 5 + 4 = 9 9- 5 = 9- 4 = 2 6 4 5 *
8和9的加减法.ppt
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