3,7,9,13的24点答案：1:7 × 9 - 3 × 132:(7 × 9) - 3 × 133:7 × 9 -(3 × 13)4:(7 × 9) - (3 × 13)5:7 × 9 - 13 × 36:(7 × 9) - 13 × 37:7 × 9 -(13 × 3)8:(7 × 9) - (13 × 3)9:(7 - 13 ÷ 3) × 910...