2x(x+3)=12x-4
<span>2x^2+6x=12x-4 </span>
<span>2x^2-6x+4=0 </span>
<span>x^2-3x+2=0 </span>
<span>(x-1)(x-2)=0 </span>
<span>x1=1, x2=2</span>
x^4- 2x^3+2x-1=(x^4-1)- (2x^3-2x)=(x^2+1)(x^2-1)-2x(x^2-1)=(x^2-1)(x^2+1-2x)=(x^2-1)(x-1)^2=(x-1)(x+1)(x-1)(x-1)
Ответ:
4<2х+4<6 =4<6х+6==========
Объяснение: