Question

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Answer 1

1)a/(a+4)-a/a-4)=a(a-4-a-4)/(a+4)(a-4)=-8a/(a+4)(a-4)
2)-8a/(a+4)(a-4)*(a+4)/a=-8/(a-4)=8/(4-a)

Answer 2

1)(а/а+4 - а/а-4)=а^2-4а-а^2-4а/(а-4)(а+4)=-8а/(а-4)(а+4)
2) -8а/(а-4)(а+4)* а+4/а= -8/а-4 = 8/4-а