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e= --------
k+1
e= (k-1)/(k+1)/*(k+1), k≠-1
e(k+1)=(k-1)
ek+e= k-1
ek-k= -e-1
k(e-1)=-e-1/:(e-1)
k= -e-1/e-1, e≠1
b)1
g= 2 - ---
k
g= 2- 1/k/*k, k≠0
gk= 2k-1
gk-2k=-1
k(g-2)=-1/:(g-2)
k= 1/g-2, g≠2