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Автор - boykomykola79

Для яких значне х квадратний тричлег -х2+х-0,21 набуває відємних значень

Ответ

Автор - solving05

Ответ:

Объяснение:

-x^2+x-0,21<0;x^2-x+0,21>0;(x-0,7)(x-0,3)>0

___0,3____0,7____

  +           -            +

x∈(-∞; 0,3)∪(0,7;+∞)

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