Ответы на вопрос:
(11x²-10x-1)/(x²-1)=(10x²+x²-10x-1)/(x²-1)=[10x(x-1)+(x²-1)]/(x-1)(x+1)= =[10x(x-1)+(x-1)(x+1)]/(x-1)(x+1)=(10x+x+1)/(x+1)=(11x+1)/(x+1);
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