Question

Calculeaza: {[(120+2x15):75+4]x 10 la puterea 2 -40x5}:80

Answer 1

{[(120+2x15):75+4]x 10^2 - 40x5}:80 =

= {[(120 + 30) : 75 +4]×100-200} : 80 =

= [(150 : 75 + 4) × 100 - 200] : 80 =

= [(2 + 4) × 100 - 200] : 80 =

= (6 × 100 - 200) : 80 =

= (600 - 200) : 80 =

= 400 : 80 =

= 5