13, 5, 7, 4的24点答案：1:(13 - 5) × (7 - 4)2:(13 × 7 + 5) ÷ 43:((13 × 7) + 5) ÷ 44:(5 + 13 × 7) ÷ 45:(5 + (13 × 7)) ÷ 46:(5 - 13) × (4 - 7)7:(5 + 7 × 13) ÷ 48:(5 + (7 × 13...