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Kmm80
@Kmm80
July 2022
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-9x⁴ + 8x² - 1= 0
решите тождество
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brodonatik
Топ) 9x⁴+8x²-1=0 ⇒x²=y ⇒⇒9y²+8y-1=0 ;y₁=(-8+√64+4·9·1)/18=(-8+10)/18=1/9;
y₂=(-8-10)/18=-1;
x²=1/9;x₁=1/3;x₂=-1/3; x²≠-1
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Answers & Comments
y₂=(-8-10)/18=-1;
x²=1/9;x₁=1/3;x₂=-1/3; x²≠-1