※ 引述《minie (散落在我手中的是温柔)》之铭言： : gwd04-Q29: : The annual rent collected by a corporation from a certain building was x : percent more in 1998 than in 1997 and y percent less in 1999 than in 1998. : Was the annual rent collected by the corporation from the building more in : 1999 than in 1997? : (1) x > y : (2) xy/100 < x – y : ANS:B : 先谢谢各位的指导~ 假设1997, 1998, 1999年的collected rent分别是r7, r8, r9 由题目可知r8=(1+x%)r7 r9=(1-y%)r8 所以r9=(1+x%)(1-y%)r7=[1+(x-y)%-xy%%]r7 题目就是在问1+(x-y)%-xy%%是否大於1，也就是(x-y)%-xy%%是否大於0 条件1 不知道xy的大小如何，无法判断 条件2 (x-y)%-xy%% = (x-y-xy%)% = (x-y-xy/100)% >0 所以答案B --

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