X^4+x^2+2x^3-8x^2-8x+12=0
x^4+2x^3-7x^2-8x+12=0
<span>x=1</span>
<span>1) 3x</span>³<span>-12 x =0
3x</span>(x²-4)=0
3x(x-2)(x+2)=0
x₁=0
x₂=2
x₃=-2
<span>
2)49x</span>³<span> +14x</span>²<span>+x=0
x(7x+1)=0
x</span>₁=0
<span>x</span>₂=-1/7
<span>
3)x</span>³<span> -5x</span>²<span>-x+5=0
x</span>²<span>(x-5)-(x-5)=0
(x-5)(x-1)x+1)=0
x</span>₁=5
x₂=1
x₃=-1
4х^2 -20х +25 +20х = 4х^2+25
13(15-2x)-9(3x-23)=-22
195-26x-27x+207=-22
-53x+402=-22
-53x=-424
x=8
ответ: 8