12. a, x ve y birer gerçek sayı olmak üzere, (x - 1) - (xy + 1) = a-y + xy ve ¹ + ¹ = 1 X x y eşitlikleri veriliyor. Buna göre, y aşağıdakilerden A) 1 a B) 1 C) -1 a-1 a-1 hangisine eşittir? D) 1 a + 1 E)-1 a +1
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