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307.9feet×12feet问到底用了多少砖 1) 36inch square 和72inch square两种规格 2)square 6×6 and 12×6 D ??
329.investment principal $6000, quarterly interests: 1Q $124; 2Q $135 3Q$141, what annual interest rate can make yearly interest 10% 3.5%, 9%, 10.% 10.5%, 12.5%
280.DS: f(x)=p^5x+q^3x+rx, f(1)=? 1> f(-1)=1; 2> pqr>0
194. 有24个brand的产品分别有4个特性(比如硬度,光泽,这个是我自己编的), 每种特性可以分为 excellent, good, passalbe and fai l四个级别,问至少有2个特性是good or excellent的有几个? i )至少有2个特性是excellent和good的brand有10个 ii)至少有3个特性是good的brand有12个
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