Question

3.упростить:
$frac{x}{x-4}+ frac{x}{4-x}$

Answer 1

$frac{x}{x-4} + frac{x}{4-x} = frac{x}{x-4} - frac{x}{x-4} = frac{x-x}{x-4} = frac{0}{x-4} = 0$