(2-x)(x-3)(x平方-5x-14)大于等于100(初一的题目)
问题描述:
(2-x)(x-3)(x平方-5x-14)大于等于100(初一的题目)
答
(2-x)(x-3)(x^2-5x-14)≥ 100-(x-2)(x-3)(x^2-5x-14)≥ 100(x-2)(x-3)(x^2-5x-14)≤ -100(x^2-5x+6)(x^2-5x-14)≤ -100(x^2-5x)^2 - 8(x^2-5x) -84 ≤ -100(x^2-5x)^2 - 8(x^2-5x) +16 ≤ 0{(x^2-...