Question

4-{2-[52+42+(4-2)-(7+8-9)+9]-7}+8

Answer 1

4-{2-[52+42+(4-2)-(7+8-9)+9]-7}+8
4-{2-[52+42+2-(7-1)+9]-7}+8
4-{2-[52+42+2-(+6)+9]-7}+8
4-{2-[52+42+2-6+9]-7}+8
4-{2-[94-4+9]-7}+8
4-{2-[90+9]-7}+8
4-{2-[+99]-7}+8
4-{2-99-7}+8
4-{-97-7}+8
4-{-104}+8
4+104+8
108+8
116

Answer 2

Olá, boa noite ☺

Resolução:

4-{2-[52+42+(4-2)-(7+8-9)+9]-7}+8
4-{2-[52 + 42 + 2 - 6 + 9 ] - 7 } + 8
4-{2-[ 94 + 2 - 6 + 9 ] - 7 } + 8
4-{2-[96 - 6 + 9 ] - 7} + 8
4-{2-[90 + 9 ] - 7} + 8
4-{2-[+99] - 7} +8
4-{2- 99 - 7 } + 8
4-{-97 - 7 } + 8
4-{-104} + 8
4 + 104 + 8
108 + 6
= 116

Bons estudos :)