(4 - х) / (16 - 4х) = (4 - х) / (4*(4 - х)) = 1/4 (или 0,25),
(х² - 3х) / (х² - 9) = х*(х - 3) / (х - 3)(х + 3) = х / (х + 3)
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(4 - х) / (16 - 4х) = (4 - х) / (4*(4 - х)) = 1/4 (или 0,25),
(х² - 3х) / (х² - 9) = х*(х - 3) / (х - 3)(х + 3) = х / (х + 3)