50以内计算题 100道 用时： 错误： 20 20 = 7 34 = 3 46 = 4 4 = 40 8 = 14 24 = 19 11 = 9 36 = 45 1 = 4 38 = 20 8 = 1 31 = 19 27 = 15 16 = 17 30 = 20 3 = 10 18 = 28 3 = 27 9 = 4 32 = 2 30 = 16 9 = 37 12 = 29 1 = 33 13 = 0 49 = 23 16 = 3 12 = 24 14 = 7 5 = 32 8 = 12 3 = 16 15 = 15 11 = 6 19 = 14 34 = 18 28 = 15 10 = 3 17 = 37 1 = 16 4 = 8 10 = 2 18 = 19 21 = 0 37 = 33 6 = 2 13 = 28 15 = 22 23 = 24 20 = 3 11 = 31 15 = 19 22 = 3 6 = 11 11 = 41 6 = 10 23 = 10 12 = 21 2 = 7 0 = 33 1 = 25 8 = 12 4 = 19 16 = 10 35 = 42 0 = 17 2 = 1 42 = 5 30 = 20 9 = 6 13 = 13 35 = 9 30 = 0 44 = 11 6 = 6 23 = 23 27 = 36 13 = 14 29 = 11 16 = 6 29 = 37 6 = 7 16 = 49 0 = 22 28 = 41 1 = 18 17 = 5 42 = 4 43 = 28 8 = 24 2 = 15 5 = 32 9 = 23 15 = 18 23 = 14 18 = 1 25 = 24 9 = 8 42 = 34 0 =