1) 3(1-2x) 4(x+2) 12(1-2x)(x+2) 6(1-2x)(x+2)
--------- * --------- = ------------------ = ----------------
2x^2 1 2x^2 x^2
2) 6(1-2x)(x+2) 2x+1 8x^3 48x^3(1-2x)(x+2)(2x+1)
----------------- * --------- * ----------------- = ---------------------------------- =
x^2 (x-2)^2 (2x-1)(2x+1) x^2(2x-1)(2x+1)*(x-2)^2
48x(1-2x)(x+2) 48x(2x-1)(-x-2) 48x(-x-2) 48x(x+2)
-------------------- = - -------------------- = - ------------ = ------------
(2x-1)*(x-2)^2 (2x-1)*(x-2)^2 (x-2)^2 (x-2)^2