Question

-20-5.[(-2).(4-7)+8-2.5]

Answer 1

$-20-5.[(-2).(4-7)+8-2.5]\to \\\\ -20-5.[(-2).(-3)+8-2.5]\to \\\\ -20-5.[6+8-10]\to \\\\ -20-5.[14 -10]\to \\\\ -20-5.[-4]\to \\\\ -20+20\to \\\\ 0$

Answer 2

- 20 - 5 . [ ( - 2 ) . ( 4 - 7 ) + 8 - 2 . 5 ]
- 20 - 5 . [ ( - 2 ) . ( - 3 ) + 8 - 10 ]
- 20 - 5 . [ + 6 + 8 - 10 ]
- 20 - 5 . [ - 4 ]
- 20 + 20
0