Question

5 ...8...6...4=74 5 ...8...6...4=82 5...8...6...4=312

Answer 1

 (5+8) * 6 - 4 =74;  

5+8=13

13*6=78

78-4=74


 (5+8)*6+4=82

5+8=13

13*6=78

78+4=82

(5 +8)* 6* 4=312

5+8=13

13*6=78

78*4=312