Question

выполните действие 3х/4х-4+5х/7-7х

Answer 1

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