Question

(a+2/a-2-a-2/a+2)÷16a/a^2-4

Answer 1

$(frac{a+2}{a-2}- frac{a-2}{a+2}): frac{16a}{a^{2} -4} = frac{(a+2)(a+2)-(a-2)(a-2)}{(a-2)(a+2)} * frac{(a-2)(a+2)}{16a}= \ \ frac{a^{2}+4a+4-a^{2} +4a-4}{16a}= frac{8a}{16a} = frac{1}{2} =0.5$