Question

12² - [4² + 3 x (10² - 8²)] : (5² + 2 x 3)

Answer 1

Respeitando hierarquia operacional

         $12^2-[4^2+3x(10^2-8^2)]:(5^2+2x3) \\ \\ =144-[16+3x(100-64)]:(25+6) \\ \\ =144-[16+3x(36)]:(31) \\ \\ =144-[16+108]:31 \\ \\ =144-124:31 \\ \\ =144-4 \\ \\ =140$

Answer 2

12² - [4² + 3 * (10² - 8 ²)] ÷ (5² + 2 * 3)
144 - [16 + 3*( 100 - 64)] ÷ (25 + 6)
144 - [16 + 108] ÷ (31)
144 - [124]  ÷ (31)
144 - 4
140

espero ter ajudado