2位数加减法计算题 100道用时：错误：
47 ＋ 12 = 24 ＋ 55 = 40 － 11 = 55 － 24 = 49 ＋ 47 = 62 － 10 = 45 ＋ 15 = 10 ＋ 27 = 11 ＋ 83 = 65 － 46 = 54 － 26 = 62 － 19 = 38 ＋ 34 = 98 － 18 = 24 ＋ 75 = 99 － 60 = 76 － 19 = 75 － 22 = 30 － 17 = 91 － 29 = 76 ＋ 10 = 42 ＋ 49 = 48 ＋ 30 = 39 － 23 = 67 － 55 = 60 － 33 = 69 － 30 = 75 － 16 = 89 － 64 = 13 ＋ 31 = 72 － 56 = 50 ＋ 48 = 17 ＋ 15 = 49 ＋ 27 = 35 ＋ 39 = 35 ＋ 59 = 43 ＋ 38 = 19 ＋ 62 = 53 － 32 = 54 ＋ 21 = 45 ＋ 24 = 79 － 66 = 58 ＋ 35 = 62 ＋ 10 = 48 ＋ 10 = 74 － 63 = 13 ＋ 42 = 39 ＋ 14 = 74 － 33 = 31 － 19 = 68 ＋ 21 = 42 ＋ 58 = 13 ＋ 60 = 90 － 20 = 34 ＋ 52 = 52 ＋ 43 = 20 ＋ 50 = 78 － 51 = 64 － 42 = 37 ＋ 46 = 12 ＋ 42 = 44 － 26 = 23 ＋ 58 = 36 ＋ 28 = 93 － 75 = 87 － 49 = 30 ＋ 32 = 81 － 13 = 28 ＋ 40 = 56 － 41 = 55 － 44 = 27 ＋ 18 = 14 ＋ 20 = 47 ＋ 22 = 51 ＋ 46 = 27 ＋ 70 = 30 ＋ 35 = 57 － 47 = 51 － 37 = 62 ＋ 38 =