Question

2 mũ 2 . 85 + 40 . 2 mũ 2 - 2 mũ 3

 

Answer 1

\(2^2.85+40.2^2-2^3\)

\(=2^2.85+40.2^2-2^2.2\)

\(=2^2.\left(85+40-2\right)\)

\(=2^2.123\)

\(=492\)

Answer 2

\(2^{2}.85+40.2^{2}-2^{3}\)

\(=2^{2}.85+40.2^{2}-2^{2+1}\)

\(=2^{2}.85+40.2^{2}-2^{2}.2^{1}\)

\(=2^{2}.(85+40-2)\)

\(=4.123\)

\(=492\)