Question

7+[12-{8+3(9 of 6+1-13×4)}]

Answer 1

7+[12-{8+3(9of6+1-13×4)}]
= 7+[12-{8+3(54+1-13×4)}]
= 7+[12-{8+3(55-52)}]
= 7+[12-{8+3(3)}]
= 7+[12-{8+9}]
= 7+[12-{17}]
= 7+[{12-17}]
= 7+[{-5}]
= 7+[-5]
= 7-5
= 2