Calculation, three questions. A-B a + 2B + B-A (1) (a-b) of (a + 2b) + (B-A) of B - (a-b) of 2A (2) (a + 2 - (2-A) of 4) divided by A-2 of a (3) (B of a + 2 + a of B) divided by (B-2 of a + a of B)

Calculation, three questions. A-B a + 2B + B-A (1) (a-b) of (a + 2b) + (B-A) of B - (a-b) of 2A (2) (a + 2 - (2-A) of 4) divided by A-2 of a (3) (B of a + 2 + a of B) divided by (B-2 of a + a of B)

(1) -1
(2) a
(3)(a+b)^2/(a-b)^2