Question

20 – {12 + [24 – 3.(2 + 5)]}

Answer 1

\(20-\left\{12+\left[24-3.\left(2+5\right)\right]\right\}\)

\(=20-\left\{12+\left[24-3.7\right]\right\}\)

\(=20-\left\{12+\left[24-21\right]\right\}\)

\(=20-\left\{12+3\right\}\)

\(=20-15\)

\(=5\)

\(#Wendy.Dang\)

Answer 2

\(20-\left\{12+\left[24-3.\left(2+5\right)\right]\right\}\) 

\(=20-\left\{12+\left[24-3.7\right]\right\}\) 

\(=20-\left\{12+\left(24-21\right)\right\}\) 

\(=20-\left(12+3\right)\) 

\(=20-15=5\)