[機經] 數學JJ新版-259.235
259. S is the sum of 1/n and 101<=n<=151,求S的範圍. 選項有0<S<1/3, 1/3<S<1/2,
1/2<S<1, 1/2<S<3/2.
問:1/3<S<1/2,最大最小值演算法??
235. 0<|X|-4X<5，等於以下哪個關係式
答案選-1<X<0
0<|X|-4X-> 4X<|X|-> X<0，之後去掉絕對值解不等
問: 4X<|X|-> X<0 如何解?
請大家幫忙,感謝
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