A = \(\dfrac{48\times48-48\times47-48}{235\times137-37\times235}\)
A = \(\dfrac{48\times48-48\times47-48\times1}{235\times137-37\times235}\)
A = \(\dfrac{48\times\left(48-47-1\right)}{235\times137-37\times235}\)
A = \(\dfrac{48\times0}{235\times137-37\times235}\)
A = 0