Question

Efectuati : {[(80-6•7)•3+6]•3+6]•2-100}•2+50

Answer 1

{[(80-42)x3+6]x2-100}x2+50=
{[38x3+6]x3+6)x2-100}x2+50=
[(114+6)x3+6)x2-100]x2+50=
((120x3+6)x2-100)x2+50=
((360+6)x2-100)x2+50
(366x2-100)x2+50=
(732-100)x2+50=
632x2+50=1314