а) у=2х-7
D(y)=(-∞; ∞)
b) y=1/(x²-2); x²-2≠0; x≠+-√2
D(y)=(-∞; -√2)U(-√2; √2)U(√2; ∞)
c) y=1/√(5x); 5x>0; x>0
D(y)=(0; ∞).
а) у=2х-7
D(y)=(-∞; ∞)
b) y=1/(x²-2); x²-2≠0; x≠+-√2
D(y)=(-∞; -√2)U(-√2; √2)U(√2; ∞)
c) y=1/√(5x); 5x>0; x>0
D(y)=(0; ∞).