一元二次绝对值不等式求解
|x^2-3x+2|>x^2-3|x|+2
我要抓狂了求不用图像的解法.
最佳答案什么的在高质量的里面选快的那位~分段讨论什么的最好了~
人气:167 ℃ 时间:2019-09-25 22:33:48
解答
(用1°、1′、1″写了啊)
1° x^2-3|x|+2<0
这时有1<|x|<2,即x∈(-2,-1)∪(1,2)
2° x^2-3|x|+2>0,得x<1或x>2
因为x^2+2>0,所以3x小于3|x|,即x<0
由此,x<0
综上所述.x∈(﹣∞,0)(1,2)果断采纳。。。。。谢谢你~
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