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4 41 14 + 1 =4 + 1 = 5 56 62 26 + 2 6 + 2 = =8 84 43 34+ 3 =4+ 3 =7 78 84 48 8 4 =4 =4 48 83 38 3 8 3 = =5 5练习：练习：2 + = 6 4 + = 8 + 5 = 72 + = 6 4 + = 8 + 5 = 77 - 5 = 8 - 3 = - 6 = 17 - 5 = 8 - 3 = - 6 = 13 + 2 = 5 + 1 = 6 - 4 = 3 + 2 = 5 + 1 = 6 - 4 = 6 - 5 = 6 + 2 = 8 - 2 = 6 - 5 = 6 + 2 = 8 - 2 =
