Вибрати заміну, яка зводить рівняня (x2 – 5x + 6)(x2 – 5x +2) = 3 до рівняння (t – a)(t + a) = 3. 1) t = x2 - 5x+2
2) t = x2 - 5x+4
3) t = x2 - 5x+6
4) t = x2 - 5x
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