(4x²-9x+2)/(2+9x-5x²)=-(4x²-9x+2)/(5x²-9x-2).
4x²-9x+2=0 D=49
x₁=2 x₂=0,25
4*(x-2)(x-0,25)
5x²-9x-2=0 D=121
x₁=2 x₂=-0,2
5*(x-2)(x+0,2)=0 ⇒
-4*(x-2)(x-0,25)/(5*(x-2)(x+0,2)=-0,8*(x-0,25)/(x+0,2)=
=0,8*(0,25-x)(x+0,2)==(0,2-0,8x)/(x+0,2).
{1 - 5х > 11
<span>{6х - 18 > 0
{-5x > 10
{ 6x > 18
{x < -2
{x > 3
решений нет</span>
64 =8^2
по формуле а^2 -b^2 =(a -b)(a+b),
a^2 =8^2; b^2 =(n +4)^2
=(8 -(n +4)) *(8 +(n +4)) =(8 -n -4)(8 +n +4) =(4 -n)(12 +n)