\(A=\frac{864\cdot48-432\cdot96}{864\cdot48\cdot432}=\frac{432\cdot2\cdot84-432\cdot2\cdot48}{864\cdot48\cdot432}=\frac{0}{864\cdot48\cdot432}=0\)
\(\frac{864.48-432.96}{864.48.432}=\frac{432.2.48-432.96}{864.48.432}=\frac{432.96-432.96}{864.48.432}=0\)