1:(x∧2减4x加1）／（3x∧2减7x加3）≤1 ,求x .

题目

1:(x∧2减4x加1）／（3x∧2减7x加3）≤1 ,求x .
2:若ax∧2＋5x＋c＞0的解集为{x|1／3＜x＜1／2}则a? c?

答案

(x^2-4x+1)/(3x^2-7x+3)《1 (移项,化简)
(2x^2-3x+2)/(3x^2-7x+3)》0
(2x^2-3x+2)恒大于零,所以,
3x^2-7x+3>0
x>(7+√13)/6或x