Ребят, решите 760 и 762 (1,2)

№760 1) (a-b)/ab - (a-c)/ac = (ac - bc - ab + bc)/abc = (ac - ab)/abc = =a(c-b)/abc = (c-b)/bc 2) = (b² + a + b)/ a²b²  остальное не видно, извините № 762 1) a/(a²-1) - 1/(1-a²) = a/(a²-1) + 1/(a²-1) = (a+1) / (a²-1) = 1/(a-1) 2) = 3y/(4x² - 9y²) - 2x/(4x² - 9y²) = (3y-2x)/(4x² - 9y²) = -(2x-3y)/(4x²-9y²) = = -1 / (2x + 3y)