Question

resolução 54:{24-3[(4 x 5-2x5)]}:2-1

Answer 1

54:{24-3[(4 x 5-2x5)]}:2-1
54:{24-3[(20-10)]}:2-1
54:{24-3[-10]}:2-1

54:{24+30}:2-1

54:{54:2} - 1

54:27 - 1 

2 - 1 ==> 1