Question

(13-1)²÷[√64÷2³+(81÷3²-8)×3]+6²

Answer 1

$(13-1)^2:[ \sqrt{64} :2^3+(81:3^2-8).3]+6^2= \\ \\ =12^2:[8:8+(81:9-8).3]+36= \\ \\ =144:[1+(9-8).3]+36= \\ \\ =144:[1+1.3]+36= \\ \\ =144:[1+3]+36= \\ \\ =144:4+36= \\ \\ =36+36=72$