a) y + 3y/(y - 3) = 4y/(y - 3)
б) 2/(x - 5) + (x + 5)/(5x) = 2/(x - 5) + (x + 5)/(5x) = (2*5 + x(x - 5))/(5x(x - 5)) = (10 + x^2 - 5x)/(5x(x - 5)) = (x^2 - 5x + 10)/(5x(x - 5))
в) 4/(x + 4) - x/(x - 4) = (4(x - 4) - x(x + 4))/((x + 4)(x - 4)) = (4x - 16 - x^2 - 4x)/((x + 4)(x - 4)) = (-x^2 - 16)/((x + 4)(x - 4))
г) 2p - q/(p^2 + pq) + (p - 2q)/(pq + q^2) = 2p - q/(p(p + q)) + (p - 2q)/(q(p + q)) = (2p(p + q) - q(p - 2q))/(p(q)(p + q)) = (2p^2 + 2pq - pq + 2q^2)/(p(q)(p + q)) = (2p^2 + pq + 2q^2)/(p(q)(p + q))
a) y + 3y/(y - 3) = 4y/(y - 3)
б) 2/(x - 5) + (x + 5)/(5x) = 2/(x - 5) + (x + 5)/(5x) = (2*5 + x(x - 5))/(5x(x - 5)) = (10 + x^2 - 5x)/(5x(x - 5)) = (x^2 - 5x + 10)/(5x(x - 5))
в) 4/(x + 4) - x/(x - 4) = (4(x - 4) - x(x + 4))/((x + 4)(x - 4)) = (4x - 16 - x^2 - 4x)/((x + 4)(x - 4)) = (-x^2 - 16)/((x + 4)(x - 4))
г) 2p - q/(p^2 + pq) + (p - 2q)/(pq + q^2) = 2p - q/(p(p + q)) + (p - 2q)/(q(p + q)) = (2p(p + q) - q(p - 2q))/(p(q)(p + q)) = (2p^2 + 2pq - pq + 2q^2)/(p(q)(p + q)) = (2p^2 + pq + 2q^2)/(p(q)(p + q))