г) 2a-b a ⋅ (2a-b a + a b).

((2a-b)/a) ⋅ ((a/(2a-b) + a/b)) = ((2a-b)/a) ⋅ ((ab+a(2a-b))/(b(2a-b))) = ((2a-b)/a) ⋅ ((ab+2a²-ab)/(b(2a-b))) = ((2a-b)/a) ⋅ ((2a²)/(b(2a-b))) = (2a²(2a-b))/(ab(2a-b)) = (2a)/b.

Ответ: (2a)/b