用有理数2;-5;7;-13算24点

每个数字只能用一次，进行加减乘除四则运算。

-（-5+7）-（2*（-13））=24

1: 2 + 5 × 7 - 13 2: (2 + 5 × 7) - 13 3: (2 + (5 × 7)) - 13 4: 2 + (5 × 7) - 13 5: 2 + (5 × 7 - 13) 6: 2 + ((5 × 7) - 13) 7: 2 + 7 × 5 - 13 8: (2 + 7 × 5) - 13 9: (2 + (7 × 5)) - 13 10: 2 + (7 × 5) - 13 11: 2 + (7 × 5 - 13) 12: 2 + ((7 × 5) - 13) 13: 2 - 13 + 5 × 7 14: (2 - 13) + 5 × 7 15: 2 - 13 +(5 × 7) 16: (2 - 13) + (5 × 7) 17: 2 - (13 - 5 × 7) 18: 2 - (13 - (5 × 7)) 19: 2 × 13 + 5 - 7 20: (2 × 13) + 5 - 7 21: (2 × 13 + 5) - 7 22: ((2 × 13) + 5) - 7 23: 2 × 13 +(5 - 7) 24: (2 × 13) + (5 - 7) 25: 2 - 13 + 7 × 5 26: (2 - 13) + 7 × 5 27: 2 - 13 +(7 × 5) 28: (2 - 13) + (7 × 5) 29: 2 - (13 - 7 × 5) 30: 2 - (13 - (7 × 5)) 31: 2 × 13 - 7 + 5 32: (2 × 13) - 7 + 5 33: (2 × 13 - 7) + 5 34: ((2 × 13) - 7) + 5 35: 2 × 13 -(7 - 5) 36: (2 × 13) - (7 - 5) 37: 5 + 2 × 13 - 7 38: (5 + 2 × 13) - 7 39: (5 + (2 × 13)) - 7 40: 5 + (2 × 13) - 7 41: 5 + (2 × 13 - 7) 42: 5 + ((2 × 13) - 7) 43: 5 - 7 + 2 × 13 44: (5 - 7) + 2 × 13 45: 5 - 7 +(2 × 13) 46: (5 - 7) + (2 × 13) 47: 5 - (7 - 2 × 13) 48: 5 - (7 - (2 × 13)) 49: 5 × 7 + 2 - 13 50: (5 × 7) + 2 - 13 51: (5 × 7 + 2) - 13 52: ((5 × 7) + 2) - 13 53: 5 × 7 +(2 - 13) 54: (5 × 7) + (2 - 13) 55: 5 - 7 + 13 × 2 56: (5 - 7) + 13 × 2 57: 5 - 7 +(13 × 2) 58: (5 - 7) + (13 × 2) 59: 5 - (7 - 13 × 2) 60: 5 - (7 - (13 × 2)) 61: (5 × 7 + 13) ÷ 2 62: ((5 × 7) + 13) ÷ 2 63: 5 × 7 - 13 + 2 64: (5 × 7) - 13 + 2 65: (5 × 7 - 13) + 2 66: ((5 × 7) - 13) + 2 67: 5 × 7 -(13 - 2) 68: (5 × 7) - (13 - 2) 69: 5 + 13 × 2 - 7 70: (5 + 13 × 2) - 7 71: (5 + (13 × 2)) - 7 72: 5 + (13 × 2) - 7 73: 5 + (13 × 2 - 7) 74: 5 + ((13 × 2) - 7) 75: 7 × 5 + 2 - 13 76: (7 × 5) + 2 - 13 77: (7 × 5 + 2) - 13 78: ((7 × 5) + 2) - 13 79: 7 × 5 +(2 - 13) 80: (7 × 5) + (2 - 13) 81: (7 - 5) × 13 - 2 82: ((7 - 5) × 13) - 2 83: (7 × 5 + 13) ÷ 2 84: ((7 × 5) + 13) ÷ 2 85: 7 × 5 - 13 + 2 86: (7 × 5) - 13 + 2 87: (7 × 5 - 13) + 2 88: ((7 × 5) - 13) + 2 89: 7 × 5 -(13 - 2) 90: (7 × 5) - (13 - 2) 91: 13 × 2 + 5 - 7 92: (13 × 2) + 5 - 7 93: (13 × 2 + 5) - 7 94: ((13 × 2) + 5) - 7 95: 13 × 2 +(5 - 7) 96: (13 × 2) + (5 - 7) 97: 13 × 2 - 7 + 5 98: (13 × 2) - 7 + 5 99: (13 × 2 - 7) + 5 100: ((13 × 2) - 7) + 5 101: 13 × 2 -(7 - 5) 102: (13 × 2) - (7 - 5) 103: (13 + 5 × 7) ÷ 2 104: (13 + (5 × 7)) ÷ 2 105: (13 + 7 × 5) ÷ 2 106: (13 + (7 × 5)) ÷ 2 107: (13 × (7 - 5)) - 2 108: 13 × (7 - 5) - 2

((3*6)-7)--13 (3*6)-(7+-13) ((3*6)--13)-7 (3*6)-(-13+7) 6-(3*(7+-13)) ((6*3)-7)--13 (6*3)-(7+-13) 6-(3*(-13+7)) ((6*3)--13)-7 (6*3)-(-13+7) 6-((7+-13)*3) 6-((-13+7)*3) ｛以上各都等于24｝

2 + 5 × 7 - 13=24 分数一定要给我哦！谢了