Выполните сложение дробей: x/х-1 + 1/1-х
x/х-1 + 1/1-х=x/х-1 +(-1)1/1-х=x/х-1-1/x-1=x-1/x-1=1
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x/х-1 + 1/1-х=x/х-1 +(-1)1/1-х=x/х-1-1/x-1=x-1/x-1=1