Răspuns:
Salut
1.x²-4x+3>0
x²-x-3x+3>0
x(x-1)-3(x-3)>0
(x-1)(x-3)>0
{x-1>0. <=>{x-1<0 <=>{x>1. <=>{x<1
{x-3>0 <=>{x-3<0 <=>{x>3<=>{x<3
x€(-oo;1)U(3,+oo)
2.{x-4=y
{x²-4x=y<=>
x-4=x²-4x
x=4
x=1
4-4=y
1-4=y
y=0
y=-3
(x1,x2)=(4;0)
(y1;y2)=(1,-3)
==evergreen==
