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请教几道8月机井
39. t1.t2,....,tn;tn+1=tn/2,问t5=? (1) t3=1/4 (2) tn-t1=15/16 参考答案:C 思路: 我觉得是A,因为有(1)可以推出t1,再加上题目已经给出了q=1/2,应该可以求出t5了吧,而(2)无法知道n所以推不出,这是个等比数列吧
67. 某人有bookcase, arrange 10 books per shelf and no books left. If he acquired 10 additional books, and arrange 12 books per shelf, no books left. Ask how many books he has before acquiring the addition 10 books A before acquiring, his books less than 96 B before acquiring, his books more than 24 参考答案:a 思路: 这题能不能讲解一下,不太理解啊
70. original selling price=加上x% 后的retail price, and final sale price=y倍的original selling price, Ask final price? A xy的值 B 3x+4Y的值 参考答案:A 思路: 这题怎么求呢?
102. 说财产tax是compound tax 的百分几, compound tax 由 custumor (?) tax 和 school tax 和另外一个tax 分别取 5:4:11 (数值5,4位置不确切)问财产tax 1: 给出school tax是多少 2: 给出另外1个tax的直,具体是什么直我不太记得了 参考答案:估计是E,除非2说的是compound tax 思路: 我也觉得这道题选D啊,知道了任何一个tax不是可以根据比例推出compound tax,进而推出财产tax吗?
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