Question

{[(2x8x5-2x15):25+(5x21:5-4x10:2)]:3}x5=

Answer 1

{[(2x8x5-2x15):25+(5x21:5-4x10:2)]:3}x5=
{[(16x5-30):25+(105:5-40:2)]:3}x5=
{[(80-30):25+(21-20)]:3}x5=
[(50:25+1):3]x5=
[(2+1):3]x5=
(3:3)x5=
1x5=
5

Answer 2

{[(2×8×5-2×15)÷25+(5×21÷5-4×10÷2)]÷3}×5
{[50÷25+1]÷3}×5
{3÷3}×5
1×5=5
Rezultatul este 5 .
Baftăă !!