总共有 13 种算法，例如：

37 + 49 = 39 + 47 = 86

37 + 49 = 44 + 42 = 86

37 + 49 = 40 + 46 = 86

37 + 49 = 47 + 39 = 86

37 + 49 = 43 + 43 = 86

37 + 49 = 38 + 48 = 86

37 + 49 = 41 + 45 = 86

37 + 49 = 42 + 44 = 86

37 + 49 = 49 + 37 = 86

37 + 49 = 45 + 41 = 86

37 + 49 = 48 + 38 = 86

37 + 49 = 37 + 49 = 86

37 + 49 = 46 + 40 = 86