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题库 / Prep2007E1-DS-95
Is ~$\frac{1}{a-b}$~ < b - a ?
(1) a < b.
(2) 1 < ~$\left | a-b \right |$~.
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
EACH statement ALONE is sufficient.
Statements (1) and (2) TOGETHER are NOT sufficient.
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1/(a−b) < (b - a) 不能推出1/(a−b) >(a-b),右边乘了-1，左边也要乘-1，再改变不等号方向。不等号两边调换可以推出改变不等式的结果，--> (b - a) >1/(a−b)
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