<span>3x²+16x-12=0</span>
D=256+144=400=20²
<span>x1=(-16-20)/6=-6
x2=(-16+20)/6=2/3</span>
<span>x^3-x^2-4x+4=0
</span>x^2(x-1)-4(x-1)=0
(x^2-4)(x-1)=0
(x-2)(x+2)(x-1)=0
x=2, x=-2, x=1
5ab-b²+25a-5b=b(5a-b)+5(5a-b)=(5a-b)(b+5)
2х²-11х+23-х²+10х-25>0
x²-x-2>0
x1+x2=1 U x1*x2=-2⇒x1=-1 U x2=2
+ _ +
_________________________________
-1 2
x∈(-≈;-1) U (2;≈)
X = 1,21(32)
100x = 121,(32)
10000x = 12132,(32)
9900x = 12011
12011-9900 = 2111
x= 1 целая 2111/9900