Question

help to solve 61-2{3[12-(13-4)/3]}

Answer 1

Calculate the stuff inside (parentheses) first, then the stuff inside [brackets]

Answer 2

61-2{3[12-(13-4)/3]}
=61-2[3(12-9/3)]
=61-2[3(12-3)]
=61-2[3(9)]
=61-2(27)
=61-54
=9

Answer 3

PEMDAS:
P - parentheses
E - exponents
MD - multiplication and division; whichever comes first
AS - addition and subtraction; whichever comes first