41、一个圆柱体的杯子放在桌子上,底面积是154,问你如果用一个东西包起它来,要多长 一个圆形的什么东东刚好可以覆盖一个154 square feet, 然后好像是问说这个圆形的东西至少要多长才能binding什么。。选项有 43 49 77 还有另外两个。。我晕~我这个记忆力。。我再好好想想~ 题目不全
底面积r2=154 可知圆柱体的r约为:7 周长为2r 约为43.96
42、两个长方形面积相等。第一个长方形的长比第二个少5,宽比第二个多3.第一个长方形的长比它的宽多三,让你求第二个长方形的面积
第一个长方形 设长a,宽b,第二个长方形 长 a+5, 宽 b-3, 则 ab=, 条件三得 a=b+3故 a=15 b=12 面积为180
43、一句话,78%的dictionary认为是对的,89%的panel认为它是对的,问你有%多少两个都认为是对的
答案有10% 50% 70% 80%
用韦恩图求解:78%+89%-x=1 则x= 67%
故:67%~78%
44、好像有一题,是说一个人有400单位的A股和200单位的B股,在年初一共价值600刀。问年末的时候一共值多少钱? A. A股这一年每单位下降了了10%,B股每单位上升了20% B. 年末的时候,A股总价值比B股总价值多120刀 这题我纠结了好久~大家看看~
400A+200B=600$ 得:2A+B=3
条件1)4000.9A+2001.2B=360A+240B=120 无法求解
条件2)400A- 200B = 120$ 无法求解
条件1)+条件2): 4000.9A - 2001.2B = 120 = 120得:3A-2B=1结合原题,可知A=1;B=1 年末600$ 选C
45、一个公司的managers的平均工资是38500,普通的是18500,总的平均工资是34500,manager有24个,问普通员工有几个?应该是6个吧。。。 2438500+18500x=34500 x = 6
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