[機經] 十二月數學no.17 - Is |x|<1
Is |x|<1 ?
1) x/|x| < x
2) x < |x|
絕對值比大小我真的很不行...救命...
條件一我可以兩邊平方去絕對值,然後得到x<-1或x>1 這樣的結論嘛?
條件二我可以得到x<0,這樣應該沒錯吧?
如果都對的話,那答案豈不是A?
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