1/(z-i) - 1/(z-1) = i+1 | * (z-i) * (z-1)
bringt dich zu einer quadratischen Gleichung.
Versuche mal.
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z-1 - (z-i) = (i+1)(z-i)(z-1)
-1 + i = (i+1) (z-i)(z-1)
-1 + i = (i+1) (z^2 - iz - z + i)
(-1+i)/(1+i) = z^2 - (1+i)z + i
(-1+i)(1-i)/((1+i)(1-i)) = z^2 - (1+i)z + i
(-1 + i + i + 1)/(1+1) = z^2 - (1+i)z + i
(2i)/2 = z^2 - (1+i)z + i
i = z^2 - (1+i)z + i
0 = z^2 - (1+i)z
0 = z ( z - (1+i))
z_(1)= 0
z_(2) = 1+i
Kontrollresultat
https://www.wolframalpha.com/input/?i=1%2F(z-i)+-+1%2F(z-1)+%3D+i%2B1
[/spoiler]