a) \(\left[\left(25-2^2.3\right)+\left(3^2.4+16\right)\right]:5\)
\(=\left[\left(25-4.3\right)\right]+\left(9.4+16\right):5\)
\(=\left[\left(25-12\right)+\left(36+16\right)\right]:5\)
\(=\left[13+52\right]:5\)
\(=65:5\)
\(=13\)
b)\(125\left(28+72\right)-25\left(3^2.4+64\right)\)
\(=125.100-25\left(9.4+64\right)\)
\(=12500-25.\left(36+64\right)\)
\(=12500-25.100\)
\(=12500-2500\)
\(=10000\)