* 4+3= 7-2= 7-6= 6+2= 5+4= 4-4= 3+6= 8+0= 8-1= 9-2= 9-8= 8-4= 7 5 1 8 9 0 9 8 7 7 1 4 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_9的加减.ppt
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