Квадратные уравнения. через Дискриминант
7. 4 = 20х - 25х2.
8. 2х = х2 +1.
9. 21х + 9х2 +10 = 0.
10. 36 = - 4х2.
11. 5 + 4х + х2 = 0.
12. 0,5х2 – 12 =0.
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