Question

320-20[(3^3+20^0):7-1]=

Answer 1

Answer 2

\(320-20\left[\left(3^3+20^0\right):7-1\right]\\ =320-20\left[\left(27+1\right):7-1\right]\\ =320-20\left[28:7-1\right]\\ =320-20\left[4-1\right]\\ =320-20.3\\ =320-60=260\)

Answer 3

\(320-20.\left[\left(3^3+20^0\right):7-1\right]\)

\(=320-20.\left[\left(27+1\right):7-1\right]\)

\(=320-20.\left(28:7-1\right)\)

\(=320-20.\left(4-1\right)\)

\(=320-20.3\)

\(=320-60\)

\(=260\)