1)y=4xˇ4-5x-1, D(y)=(-∞,∞)=R
2)y=(3.-2xˇ4)/(x-3), x-3≠0, x≠3, D(y)=(-∞,3)∪(3,∞)
3)y=√(-x²-4x+5), -x²-4x+5≥0, x²+4x-5≤0, (x+2)²-4-5≤0,
(x+2)²-9≤0, (x+2)²≤9, /x+2/≤3, x∈/-5,1/, -5≤x≤1
4)y=(x-1)/√(x²-9), √(x²-9)≠0,x²-9 bolše čem 0, x² bolše čem 9,
x menše čem -3 ili x bolše čem 3, x∈(-∞,-3)∪(3,∞)