a) (a/b - b/a) × 3ab/a + b = a^2-b^2/ab × 3ab/a + b = (a^2 - b^2) × 3/a + b = 3a^2 - 3b^2/a + b
б) (1 - 2a/b + a^2/b^2) × b/a - b = b^2 - 2ab + a^2/b^2 × 1/a - b = (a - b)^2/b × 1/a - b = a - b/b
/ - черта дроби
^2 - степень
