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8、9的加减法65813609338436466+2=62+6=8- =8- =886225+3=8 8-5=33+5=8 8-3=51 + 7 = 8 8 - 1 = 77 + 1 = 8 8 - 7 = 12 + 6 = 8 8 - 2 = 66 + 2 = 8 8 - 6 = 23 + 5 = 8 8 - 3 = 55 + 3 = 8 8 - 5 = 34 + 4 = 8 8 - 4 = 4记住这4个算式我就会说出其他几个算式?767765765576556765567765567 8188118811 + 8 = 9 9 - 1 = 88 + 1 = 9 9 - 8 = 12 + 7= 9 9 - 2 = 77 + 2= 9 9 - 7 = 23 + 6 = 9 9 3 = 66 + 3 = 9 9 6 = 34 + 5 = 9 9 4 = 55 + 4 = 9 9 5 = 4