问题描述: (2-x)(x-3)(x平方-5x-14)大于等于100(初一的题目) 1个回答 分类:数学 2014-11-11 问题解答: 我来补答 (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^2-5x) - 4 }^2 ≤ 0x^2-5x - 4 = 0x= 【5±根号{(-5)^2-4*1*(-4)}】/2 = (5±根号41)/2 展开全文阅读