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P=1/3a²+2/3ax
x=P-1/3a²/2/3a
x=3P-a²/2a
d) d=k/k-1
dk-d=k
dk-k=d
k(d-1)=d
k=d/d-1
e) e=k-1/k+1
ek+e=k-1
ek-k=-1-e
k(e-1)=-1-e
k=-1-e/e-1
f) f=k+1/k + a
fk+fa=k+1
fk-k=1-fa
k(f-1)=1-fa
k=1-fa/f-1
g) g= 2- 1/k
k=1/g
i) i=a/2 + 2/k
k=a/2 + 2/i
Nie wiem czy to dobrze
P=1/3 a² + 2/3 ax /×3
3P = a² +2ax
2ax=3P - a² /:a
2x=3P/a -a /:2
x=3P/2a -2a
d)
d=k/k-1 /×(k-1)
d(k-1)=k
dk -d=k
k=dk-d
e)
e=k-1/k+1 /×(k+1)
e(k+1)=k-1
ek +e=k-1
k=ek + e + 1
f) f=k+1/k + a /×(k+a)
f(k+a)=k+1
fk +fa=k+1
k=fk+fa-1
g) g= 2- 1/k /×k
gk=2k-1
2k=gk+1 /:2
k=gk+1/2
i) i=a/2 + 2/k /×2k
2ik=ak +4
ak=2ik - 4 /:a
k=2ik-4/a
d) k=-d/(1-d)
e)k=(e+1)/(1-e)
f)k=(fa-1)/(1-f)
g) k= 1/(2-g)
i)k=4/(2i-a)