(5+7)×（10－8）＝24
1: (5 + 7) × (10 - 8)2: (7 + 5) × (10 - 8)3: (10 - 8) × (5 + 7)4: (10 - 8) × (7 + 5)给你个网址http://www.dffy.com/tool/24.htm
（10-8)*(5+7)=24
(5+7)*(10-8)=24
