D(y):
{x >= 0
{2x²-5 ≠ 0
2x² ≠ 5
x² ≠ 5/2
x ≠ ±✓(5/2)
x€[0; ✓(5/2))U(✓(5/2); +∞)
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D(y):
{x >= 0
{2x²-5 ≠ 0
2x² ≠ 5
x² ≠ 5/2
x ≠ ±✓(5/2)
x€[0; ✓(5/2))U(✓(5/2); +∞)