Question

{11-2x[16:(450:9-6x7)+42:7-4]}x3-1

Answer 1

={11-2×[16:(50-42)+2]×3-1
=[11-2×(16:8+2)×3-1
=11-2×4×3-1
=11-24-1
=-36

Answer 2

{ 11 - 2 x [ 16 : ( 450 : 9 - 6 x 7 ) + 42 : 7 - 4 ] } x 3 - 1= 8 
= { 11 - 2 x [ 16 : ( 50 - 42 ) + 6 - 4 ] } x 3 - 1 =
= [ 11 - 2 x ( 16 : 8 + 6 - 4 ) ] x 3 - 1 =
= [ 11 - 2 x ( 2 + 2 ) ] x 3 - 1 =
= ( 11 - 2 x 4 ) x 3 - 1 =
= ( 11 - 8 ) x 3 - 1 =
= 3 x 3 - 1 =
= 9 - 1 =
= 8