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A country's per capita national debt is its national debt divided by its population. Is the per capita national debt of Country G within $5 of $500?
(1) Country G's national debt to the nearest $1, 000,000,000 is $43,000,000,000.
(2)Country G's population to the nearest 1, 000, 000is 86,000,000.
分析A选项
分析B选项
分析C选项
分析D选项
分析E选项
题干:debt/population的范围是否在【495,505】内?
1.debt四舍五入到十亿分为为43,000,000,000,则42,500,000,000<=debt<=43,400,000,000 ,未知人口数量,不充分
2.人口四舍五入到百分位为86,000,000,则85,500,000<=人口<=86,400,000 ,未知debt数量,不充分
1+2 42,500,000,000/86,400,000得d/p下限,43,400,000,000/85,500,000得上限,范围大于495到505的范围,即有可能满足也可能不满足题干,不充分
379832ntftl
这么大的除法运算要怎么快速算出来啊。。。。
猜猜酱
within 5 of 500的意思是范围在(495,505) 然后nearest $1, 000,000,000 is $43,000,000,000.的意思是这个数属于【42,500,000,000,43,400,000,000】 同理nearest 1, 000, 000is 86,000,000.的意思是【85,500,000,86,400,000】 然后大除以小,小除以大,算范围
猜猜酱回复猜猜酱
是【495,505】闭区间,打错了
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2022-11-19 21:41:10
猜猜酱回复猜猜酱
12.2再补充: 算出来左边界值和右边界值都超出了,但这道题仍然选E,因为代表着这个per capita可以within也可以不within 太坑了。。。。
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2022-12-03 00:12:37
680461elv
within 5 of 500的意思是范围在(495,505)
贾思敏
题干:人均debt=nation debt/population 问人均debt在【495,505)范围内吗? 明显条件一、条件二单独是不充分的,所以直接排除ABD 再看看结合充不充分: 条件一:国家总debt在425*10^8到435*10^8之间(435*10^8不可取) 条件二:总人口在855*10^5到865*10^5之间(865*10^5不可取) 结合就是: 最大的国家总debt除以最小的总人口数; 最小的国家总debt除以最大的总人口数,那就是人均debt的范围了。 即(435*10^8)/(855*10^5)=(4350*10^7)/(855*10^5)=4350*10^2/855-约等于508.8 (425*10^8)/(865*10^5)=4250*10^2/865-约等于491.3 综上,人均debt的范围就是【491.3,508.8】 而题干这个【495,505)范围只是综上范围包含的小范围,也就是说,人均debt可以小于505,也可以是大于505的,不充分。 反思:我丢,这道题就是让你以为结合就是充分,然后错选了,没想到这个范围还是会给你设坑,要细心!
sjz
题目就是问范围,495<= debt/p <=505? 1.debt是42,500,000,000-43,500,000,000 2.p是85,500,000-86,500,000 这里不用想就是d/p的范围 435000/855=508.XXXXX 这里就不用算了因为超出505了所以1+2不成立
637298zxft回复sjz
你这思路是错的 当然要算 如果最小值也大于495 这题就选c了
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2021-11-17 19:38:48
637298zxft回复sjz
505
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2021-11-17 19:41:05
Chen720
这道题在说啥?
ytt回复Chen720
感觉是题目打错了,S5不知道它是想说什么鬼;考点估计是比较题目里的数值和区间1,000,000,000/86,000,000 ~ 43,000,000,000/1000,000
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2019-10-26 13:25:11
Chen720回复 ytt
嗯嗯,谢谢~
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2019-10-29 20:02:00
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