Question

5² -7.(-2)³ -[-20:(-2)² +6.(-1)⁴ -3]+(-5)² :(-5)

Answer 1

5² - 7 .(-2)³ - [-20 :(-2)² + 6.(-1)^4 - 3] + (-5)² : (-5) = 
25 - 7 .(-8) - [ -20 : (4) + 6. (1) - 3 ] + (25) : (-5) =
25 + 56 -  [ -20 : 4 + 6 - 3 ] +  ( - 5 ) =
25 - 56 - [-5 + 6 - 3 ] - 5 =
25 - 56 - [-2] - 5 =
25 - 56 + 2 - 5 =
-31 + 2 - 5 =

-29 - 5 =  -34