Формула --- сумма кубов)))
2х⁴-19х²+9=0пусть х²=t
2t²-19t+9=0
D=361-72=289
t₁=19-17\4=0.5
t₂=19+17\4=9
x²=0.5
x=⁺⁻√0.5
x²=9
x=⁺⁻3
Ответ: ⁺⁻√0.5;⁺⁻3
<span>х = 0,(87) <=> 100х = 87,(87) <=> 100х - 87 = 0,(87) <=> 100х - 87 = х <=> 99х = 87 <=> х = 87/99 = 29/33</span>
2,48 + 3 5/9*9/16=2,48 + 32/9*9/16=2,48+2=4,48