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20以内加减混合计算题 50道 用时： 错误： 13 1 4 = 1 2 3 = 13 2 4 = 18 0 3 = 14 10 2 = 2 4 14 = 17 4 0 = 12 9 17 = 17 2 2 = 16 15 2 = 1 16 14 = 1 0 10 = 6 3 0 = 5 13 4 = 2 1 0 = 5 15 2 = 10 8 7 = 3 8 0 = 9 9 14 = 14 1 1 = 9 4 2 = 0 16 6 = 3 6 3 = 1 16 16 = 3 0 2 = 6 0 4 = 8 8 15 = 7 2 12 = 17 1 4 = 1 3 6 = 12 5 3 = 13 10 7 = 9 3 3 = 19 6 8 = 19 8 5 = 19 6 9 = 9 5 1 = 0 3 4 = 7 8 3 = 9 0 9 = 4 0 14 = 12 7 1 = 9 2 5 = 12 2 7 = 9 2 6 = 2 8 10 = 9 7 17 = 4 3 7 = 18 7 6 = 6 13 15 =
