10,9,2,13的24点答案：1:10 × 2 - 9 + 132:(10 × 2) - 9 + 133:(10 × 2 - 9) + 134:((10 × 2) - 9) + 135:10 × 2 -(9 - 13)6:(10 × 2) - (9 - 13)7:10 × 2 + 13 - 98:(10 × 2) + 13 - 99:(10 × 2 + 13) - 9...