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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.
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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
680461elv
within 5 of 500的意思是范围在（495，505）
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2022-06-13 11:59:40
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！
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2021-11-02 15:04:37
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
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2019-12-22 03:28:24
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？
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2019-10-15 11:58:42
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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