\(\frac{25}{4}+\frac{225}{16}:\frac{-3375}{512}\)
\(\frac{25}{4}+\frac{-32}{15}\)
\(=\frac{247}{60}\)
\(\frac{25}{4}+25\times\frac{9}{16}:\left[\frac{125}{64}\times\left(\frac{-27}{8}\right)\right].\)
\(=\frac{25}{4}+25\times\frac{9}{16}:\frac{-3375}{512}\)
\(=\frac{25}{4}+\frac{225}{16}:\frac{-3375}{512}\)
\(=\frac{25}{4}+\frac{-32}{15}\)
\(=\frac{247}{60}\)