Решить по теме: "Формулы корней квадратного уравнения".Такие уровнения:
a)x² + 4x - 5 = 0
б)x² + 5x +4 = 0
в)x² - 5x +6 = 0
г)x² - 2x+6 = 0
д)x²- 8x +16 = 0
е)x² - 10x +21 = 0
ж)2x² + 3x + 1 = 0
з)6x² - 5x + 1 = 0
к)2x² x - 3 = 0
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