(a/a-1-2/a^-1)除以(1-1/a+1)=

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(a/a-1-2/a^-1)除以(1-1/a+1)=(a/a-1-2/a^-1)除以(1-1/a+1)=(a/a-1-2/a^-1)除以(1-1/a+1)=[a/(a-1)-2/(a^2-1)]÷[1

(a/a-1-2/a^-1)除以(1-1/a+1)=
(a/a-1-2/a^-1)除以(1-1/a+1)=

(a/a-1-2/a^-1)除以(1-1/a+1)=
[a/(a-1)-2/(a^2-1)]÷[1-1/(a+1)]
=[a(a+1)/(a-1)(a+1)-2/(a-1)(a+1)]÷[(a+1-1)/(a+1)]
=[a(a+1)/(a^2-1)-2/(a-1)(a+1)]÷[a/(a+1)]
=[a(a+1)-2/(a-1)(a+1)]÷[a/(a+1)]
=(a^2+a-2)/(a-1)(a+1)]÷[a/(a+1)]
=(a+2)(a-1)/(a-1)(a+1)÷[a/(a+1)]
=(a+2)/(a+1)÷[a/(a+1)]
=(a+2)/(a+1)*(a+1)/a
=(a+2)/a