a) (a-b)/3a + (a+b)/3a = 2a/3a = 2/3
б) (5x-1)/x^2 - (3c-5)/x^2 = (5x-1 - 3c + 5)/x^2 = (5x - 3c + 4)/x^2
в) (3x+y)/3x + (x-2y)/6x = (2(3x+y) + (x-2y))/6x = (6x + 2y + x - 2y)/6x = (7x)/6x = 7/6
a) (a-b)/3a + (a+b)/3a = 2a/3a = 2/3
б) (5x-1)/x^2 - (3c-5)/x^2 = (5x-1 - 3c + 5)/x^2 = (5x - 3c + 4)/x^2
в) (3x+y)/3x + (x-2y)/6x = (2(3x+y) + (x-2y))/6x = (6x + 2y + x - 2y)/6x = (7x)/6x = 7/6