78 加法 21 等于多少？

78 + 20 = 98 78 + 22 = 100 78 + 19 = 97 78 + 23 = 101 78 + 24 = 102 78 + 18 = 96 78 + 25 = 103 78 + 17 = 95 77 + 21 = 98 79 + 21 = 100 76 + 21 = 97 80 + 21 = 101 75 + 21 = 96 81 + 21 = 102 74 + 21 = 95 82 + 21 = 103 1 + 98 = 99 2 + 97 = 99 3 + 96 = 99 4 + 95 = 99 5 + 94 = 99 6 + 93 = 99 40 + 33 = 73 37 + 30 = 67 58 + 1 = 59 51 + 34 = 85 22 + 37 = 59 14 + 2 = 16 100 - 1 = 99 9 × 11 = 99