1) x-pi/4=pi/2+2pik x=3pi/4+2pik.2) 2x-4<=x+1 x<=5 2x-4>0 x>2 (2;5].3) 2x-4<=x^2-3x+2 x^2-5x+6>=0 x<=2 U x>=3 x>2 x^2-3x+2>0 x>2 U x<1(2;3]4) 9^x+3*3^x-4=0 3^x=t t>0 t^2+3t-4=0 t1=1 x=0 t2=-4.
1) x-pi/4=pi/2+2pik x=3pi/4+2pik.
2) 2x-4<=x+1 x<=5 2x-4>0 x>2 (2;5].
3) 2x-4<=x^2-3x+2 x^2-5x+6>=0 x<=2 U x>=3
x>2 x^2-3x+2>0 x>2 U x<1
(2;3]
4) 9^x+3*3^x-4=0
3^x=t t>0
t^2+3t-4=0 t1=1 x=0
t2=-4.