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数学
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不等式|x²-3x|>4的解是
求详细的↖(^ω^)↗.初升高伤不起啊╭(╯^╰)╮
人气:181 ℃ 时间:2020-01-28 12:20:07
解答
|x²-3x|>4
①x²-3x>4
x²-3x-4>0
(x-4)(x+1)>0
x>4或x<-1
②x²-3x<-4
x²-3x+4<0
(x-3/2)²-9/4+4<0
(x-3/2)²<-27/4 <0,与平方数为非负矛盾
所以不等式的解释x>4或x<-1
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