(x-x1)(x-x2)((x-1/4)+V5)((x-1/4)-V5)(x-1/4)^2-5x^2-0,5x+0,0625-5=x^2-0.5x-4.9375
<span>4x - 12 x² = 4x (1 - 3x)
</span>4x - 12 x² = 4x - 12х²
х=0
=log2 (18/3)=log2 (6)=log2(2×3)=log2 (2)+log2 (3)=1+log2 (3)
5(х+1)-13>=7х+20
5х+5-13>=7х+20
5х-8>=7х+20
5х-7х>=20+8
-2x>=28
X>=-14
(-14;+бесконечность)