Verified answer

1) 2х²-8х+8≤0

х²-4х+4≤0

(х-2)²≤0

х=2

3) 9х²-30х+25<0

(3x-5)²<0

х∈∅

5) x*(2x-1)≥0

x=0   x=1/2=0.5

_____0_____0.5______

+              -              +

x∈(-∞;0]∪[0.5;+∞)