不等式数学题 X(3-X) ≤ X(X+2)-1
问题描述:
不等式数学题 X(3-X) ≤ X(X+2)-1
X(3-X) ≤ X(X+2)-1
答
X(3-X) ≤ X(X+2)-1
3x-x² ≤ x²+2x-1
-2x²+x+1 ≤ 0
2x²-x-1 ≥ 0
(2x+1)(x-1) ≥ 0
x≥1或x≤-1/2