x²-2x+1 - квадрат разности = (x-1)^2
Тогда x²-2x+1/x-1 = (x-1)^2/x-1 = x-1
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x²-2x+1 - квадрат разности = (x-1)^2
Тогда x²-2x+1/x-1 = (x-1)^2/x-1 = x-1