x(9-3x)≥3 2x(根号6)
问题描述:
x(9-3x)≥3 2x(根号6)
答
x(9-3x)≥3
x(3-x)≥1
x^2-3x+1≤0
(x-1.5)^2≤5/4
-√5/2≤ x-1.5 ≤√5/2
(3-√5) /2≤ x ≤(3+√5)/22x[(√6)-x]0(x-√6/2)^2>0x≠√6/2或者x∈(-∞,√6/2)∪(√6/2,+∞)