Question

Упростите:
(а-2/а+2 - а+2/а-2) + 12а/4-а2 =

Answer 1

$(frac{a-2}{a+2} - frac{a+2}{a-2}) + frac{12a}{4- a^{2} }= frac{ a^{2} -4a+4- a^{2}-4a-4 }{(a+2)(a-2)} - frac{12a}{ a^{2}-4 }=- frac{8a}{ a^{2}-4 } + frac{12a}{ a^{2}-4 } =$$frac{4a}{ a^{2} -4}$