2.116. Решите уравнение: 1) x⁴ – 5х² + 4 = 0;
2) x⁴ – 8х² - 9 = 0;
4) x⁴ + 5х² + 10 = 0;
5) 2x⁴ – 5х² + 3= 0;
3) x⁴ — 11х² + 30 = 0;
6) 9х⁴ + 23х² -12 = 0.
ДАЮ 20 БАЛОВ​
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