\(M=\frac{\frac{3}{19}+\frac{3}{5}-\frac{3}{2015}}{\frac{4}{19}-\frac{4}{2015}+\frac{4}{5}}=\frac{\frac{3}{19}+\frac{3}{5}-\frac{3}{2015}}{\frac{4}{19}+\frac{4}{5}-\frac{4}{2015}}\)
\(\frac{3\left(\frac{1}{19}+\frac{1}{5}-\frac{1}{2015}\right)}{4\left(\frac{1}{19}+\frac{1}{5}-\frac{1}{2015}\right)}=\frac{3}{4}\)
M=\(\frac{\frac{3}{19}+\frac{3}{5}-\frac{3}{2015}}{\frac{4}{19}-\frac{4}{2015}+\frac{4}{5}}=\frac{3.\left(\frac{1}{19}+\frac{1}{5}-\frac{1}{2015}\right)}{4.\left(\frac{1}{19}+\frac{1}{5}-\frac{1}{2015}\right)}\)=\(\frac{3}{4}\)