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(1) [?] f(x) = (x + 2 )2. ? 7 ????? ( ?2 , ?7 ). [?] f(x) = 2 ??? x ? x2 + 4x ? 3 = 2, x2 + 4x ? 5 = (x + 5)(x ? 1) = 0 ?. ? x = ?5,1 ????



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