1).a/a^2-4 - 8/a^2+2a=a/(a-2)*(a+2) - 8/a(a+2)=(a^2-8*(a-2))/a*(a+2)*(a-2)=
(a^2-8a+16)/a*(a+2)*(a-2) = (a-4)^2/a*(a+2)*(a-2).
2). (a-4)^2/a*(a+2)*(a-2)*a*(a-2)/(4-a)=(4-a)/(a+2).
3). (4-a)/(a+2) + (a+8)/(a+2) = (4-a+a+8)/(a+2)=12/(a+2)
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1).a/a^2-4 - 8/a^2+2a=a/(a-2)*(a+2) - 8/a(a+2)=(a^2-8*(a-2))/a*(a+2)*(a-2)=
(a^2-8a+16)/a*(a+2)*(a-2) = (a-4)^2/a*(a+2)*(a-2).
2). (a-4)^2/a*(a+2)*(a-2)*a*(a-2)/(4-a)=(4-a)/(a+2).
3). (4-a)/(a+2) + (a+8)/(a+2) = (4-a+a+8)/(a+2)=12/(a+2)