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x² - x ≠ 0
x(x-1) ≠ 0
x≠0 ∧ x-1≠0
x≠0 i x≠1
Odp. B
2.
P=a²√3/4
a²√3/4 =18√3
a²/4 = 18
a²=4*18
a=√72 = 6√2
h=a√3/2
r=2/3 * h
h=6√6/2 = 3√6
r=2√6
P=π * (2√6)²=4*6π
P=24π