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c=bk+b+2k
-2k-bk=b-c\*(-1)
2k+bk=-b+c
k(2+b)=-b+c\/(2+b)
k=-bc/2+b
c=kb+b+2k
kb+b+2k=c
kb+2k=c-b
k(b+2)=c-b//(b+2)
k=c-b/b+2
d)d=k/k-1 //*k-1
d(k-1)=k
dk-d=k
dk-k=d
k(d-1)=d//:d-1
k=d/d-1
e)e=k-1/k+1 //*(k+1)
e(k+1)=k-1
ek+e=k-1
ek+e-k=-1
ek-k=-1-e
k(e-1)=-1-e //:e-1
k=-1-e/e-1
f) f= k+1/k +a //*(k+a)
fk+fa=k+1
fk+fa=k+1
fk-fa-k=1
k(f-a-1)=1 //:f-a-1
k=1/f-a-1
g) g=2- 1/k //*k
gk=2k-1
gk-2k=-1
k(g-2)=-1 // :g-2
k=-1/g-2
h) h= ka²+k
ka²+k=h
k(a²+1)=h //:a²+1
k=h/a²+1
i) i= a/2+ 2/k//*2
2i=a+4/k //*4
2ik=ak+4
k(2i-a)=4 //: 2i-a
k=4/2i-a