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(x-81)(x-27) ≤ 0
x² - 27x - 81x + (81.27) ≤ 0
x² - 108x + (81.27) ≤ 0
(x-81)(x-27) ≤ 0
x ≤ 81 atau x ≤ 27
Jadi HP = { 27 ≤ x ≤ 81 }
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