829. Розв’яжіть рівняння: 1) x2 - 5x + 6 = 0; 3) 3x² + 5x + 2 = 0; 5) x2 + x - 90 = 0; 2) 2x² + 5x - 3 = 0; 4) x2 + 10x + 25 = 0; 6) x2 - 10x - 24 = 0.
ДАЮ 50 БАЛІВ​
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