\(A=50+\left\{30-2\left[14-48:\left(5-1\right)^2\right]\right\}\)
\(=50+\left\{30-2\left[ơ14-48:4^2\right]\right\}\)
\(=50+\left\{30-2\left[14-48:16\right]\right\}\)
\(=50+\left\{30-2\left[14-3\right]\right\}\)
=\(50+\left\{30-2\left[14-11\right]\right\}\)
\(=50+\left\{30-2.11\right\}\)
\(=50+\left\{30-22\right\}\)
\(=50+8\)
\(=58\)
=50+{30-2[14-48:16]}
=50+{30-2[14-3]}
=50+{30-2.11}
=50+{30-22}
=50+8
=58