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e)
e=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=-1-e/e-1
f)
f=k+1/k+a /×k
fk=k+1+ak
-1=k+ak-fk
-1=k(1+a-f) /:(1+a-f)
k+-1/1+a-f
g)
g=2-1/k /×k
gk=2k-1 /-2k
gk-2k=-1
k(g-2)=-1(g-2)
k=-1/g-2
h)
h=ka²+k
h=k(a²+1) /:(a²+1)
k=h/a²+1