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warunek: x ≠ 5
b) x² - 6x + 9/4x² - 36 = (x - 3)²/(2x - 6)(2x + 6) = (x - 3)(x - 3)/2(x - 3)2(x - 3) = 1/4
warunek: x ≠ 3
c) 9x² - 1/9x² - 6x + 1 = (3x - 1)(3x + 1)/(3x - 1)(3x - 1) = 3x + 1/3x - 1
warunek: x ≠ 1/3