Question

( frac{x}{x-1}-1 ) * frac{xy-y}{x}

Answer 1

$( frac{x}{x-1}-1 ) * frac{xy-y}{x} = \ frac{x - x + 1}{x - 1} times frac{y(x - 1)}{x} = \ = frac{1}{x - 1} times frac{y(x - 1)}{x} = \ = frac{y}{x}$