Question

Answer 1

\(12+\left[139-2\cdot\left(4^2+10\right)\right]\)
\(=12+\left[139-2\cdot26\right]\)
\(=12+\left[139-52\right]\)
\(=12+87=99\)

Answer 2

\(12\left[139-2\left(4^2+10\right)\right]\\ =12\left[139-2.36\right]\\=12\left[139-72\right]\\ =12.67=804 \)

Answer 3

$12+\left[139-2\cdot \left({}^{}+10\right)\right]$
$=12+\left[139-2\cdot 26\right]$
$=12+\left[139-52\right]$
$=12+87=99$

Answer 4

\(=12+\left[139-2.26\right]\\ =12+\left[139-52\right]\\ =12+87=99\)

Answer 5