Question

выполните действие 3х/4х-4+5х/7-7х

Answer 1

$\frac{3x}{4x - 4} + \frac{5x}{7 - 7x} = \frac{3x}{4(x - 1)} + \frac{5x}{7(1 - x)} = \frac{3x}{4(x - 1)} - \frac{5x}{7(x - 1)} = \frac{21x + 20x}{28(x - 1)} = \frac{41x}{28x - 28)}$