4 加法 17 等于多少？

4 + 16 = 20 4 + 18 = 22 4 + 15 = 19 4 + 19 = 23 4 + 20 = 24 4 + 14 = 18 4 + 21 = 25 4 + 13 = 17 3 + 17 = 20 5 + 17 = 22 2 + 17 = 19 6 + 17 = 23 1 + 17 = 18 7 + 17 = 24 8 + 17 = 25 9 + 17 = 26 1 + 20 = 21 2 + 19 = 21 3 + 18 = 21 5 + 16 = 21 6 + 15 = 21 7 + 14 = 21 9 + 33 = 42 50 + 74 = 124 37 + 4 = 41 92 + 57 = 149 82 + 82 = 164 43 + 64 = 107 90 - 69 = 21 28 - 7 = 21