数学试题讨论稿第七篇（187--238）
<p> 187. <span word="X">X</span>=? |<span word="X">X</span>-5|=10 ; |<span word="X">X</span>|-5=10 ; <span word="answer">answer</span>: <span word="C">C</span></p><p> 188. <span word="An">An</span>= 4<span word="An">An</span>-1 +3, <span word="A">A</span>3=<span word="X">X</span>, <span word="A">A</span>1=? <span word="answer">answer</span> : /16</p><p> 解: <span word="A">A</span>3=4+3=16<span word="A">A</span>1+15</p><p> 189. 50 <span word="pounds">pounds</span> 岩石中 5% 为金属, <span word="ten">ten</span> <span word="times">times</span> <span word="as">as</span> <span word="much">much</span> <span word="sliver">sliver</span> <span word="as">as</span> <span word="gold">gold</span>, <span word="gold">gold</span>=?</p><p> 解:505%=2.5 , <span word="gold">gold</span>=2.5/11=0.227</p><p> 注:原题也许理解有歧义, 在得到更具体的原题之前,请理解为金属包括<span word="sliver">sliver</span> <span word="and">and</span> <span word="gold">gold</span>,</p><p> 190. 一个出租车公司买入时一次买入5辆，租出时一次租出3辆，如果买入5辆或租出3辆都算是一次，并且去年增长了14辆车，问一共是多少次。</p><p> <span word="A">A</span>.3 <span word="B">B</span>.4 <span word="C">C</span>.5 <span word="D">D</span>.6 <span word="E">E</span>.7</p><p> 解:5<span word="x">x</span>-3<span word="y">y</span>=14, <span word="X">X</span>=4,<span word="Y">Y</span>=2</p><p> 191. 温度计刻度的那道题。 <span word="answer">answer</span>: <span word="D">D</span></p><p> 同40题. 见 2005年09月数学机经讨论稿第一篇 09/09更新</p><p> 192. 坐标系上一个正方形范围,过,,,,求一个方程<span word="x">x</span>^2+<span word="y">y</span>^21的<span word="PROBABILITY">PROBABILITY</span> <span word="answer">answer</span>: <span word="pai">pai</span> / 4</p><p> 同20题 见 2005年09月数学机经讨论稿第一篇 09/09更新</p><p> 193. <span word="DS">DS</span>：一个长方形的长比宽多5，问周长是多少。<span word="A">A</span>.知道对角线的长度。<span word="B">B</span>.知道面积</p><p> 本题请进一步讨论</p><p> 194. <span word="DS">DS</span>：<span word="x">x</span>0,问<span word="y">y</span>0? . 7<span word="x">x</span>2<span word="y">y</span> . <span word="y">y</span>-<span word="x">x</span> <span word="answer">answer</span>: <span word="E">E</span></p><p> 195. <span word="PS">PS</span>：某公司的員工，參加退休計畫的有60%, 而這些參加退休計畫的人，有1/4的人參加健康計畫，没参加退休计划的人当中，有12.5%的人参加了健康计划問全公司參加健康計畫的人當中，參加退休計畫的比例 是多少 <span word="answer">answer</span>: 3/4</p>
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