数学试题讨论稿第十一篇（342--381）
<p> 382. 个商店<span word="S">S</span>和<span word="T">T</span>,去年<span word="T">T</span>卖的<span word="HARDCOVER">HARDCOVER</span>比<span word="S">S</span>少20%,<span word="T">T</span>卖的<span word="PAPERCOVER">PAPERCOVER</span>比<span word="S">S</span>多120%,总体销售量<span word="T">T</span>是<span word="S">S</span>的两倍,求<span word="S">S</span>卖的<span word="HARDCOVER">HARDCOVER</span>和<span word="PAPERCOVER">PAPERCOVER</span>的<span word="RATIO">RATIO</span>.</p><p> 本题同166,128,373. <span word="S">S</span>和<span word="T">T</span>两个书店卖<span word="hardcopy">hardcopy</span>和<span word="softcopy">softcopy</span>，<span word="T">T</span>卖的<span word="H">H</span>比<span word="S">S</span>少20%，<span word="T">T</span>卖的<span word="P">P</span>比<span word="S">S</span>多120%，<span word="T">T</span>卖的总数是<span word="S">S</span>的两倍，问，<span word="S">S</span>卖的<span word="H">H</span>:<span word="P">P</span>是多少</p><p> <span word="My">My</span> <span word="ans">ans</span>: 画个表格比较清楚，答案是1：6</p><p> <span word="HP">HP</span></p><p> <span word="shpx">shpx</span></p><p> <span word="t">t</span>0.8<span word="h">h</span>2.2<span word="p">p</span>2<span word="x">x</span></p><p> 383. 9个人里挑四个去干什么事情,问有多少中可能</p><p> 同231. 9个委员中选4个委员组成委员会，不考虑顺序，问几种选法?<span word="C">C</span>94=126</p><p> 384<span word="NEW">NEW</span>!. <span word="A">A</span>完成某工作的1/4用2小时,剩下的工作<span word="A">A</span>和<span word="B">B</span>一起完成用了4.5小时,问单独完成整个工作用几个小时</p><p> <span word="B">B</span>单独完成需要<span word="X">X</span>小时, <span word="A">A</span>单独完成需要8小时, / =4.5, 得<span word="X">X</span>=24</p><p> 385. 好象是<span word="X">X</span>^2-6<span word="XY">XY</span>-9<span word="Y">Y</span>^2=16 问^4等于多少反正就这么个意思,大家应该明白吧</p><p> 同69. <span word="x">x</span>^2-6<span word="xy">xy</span>+9<span word="y">y</span>^2=16, ^4=? 答案 256</p><p> 386. 0.009999乘10^<span word="N">N</span>之后得到一个大于10^3的数,问<span word="N">N</span>最小为多少</p><p> 同358<span word="NEW">NEW</span>!. 0.00999乘以10的几次访大于1000，</p><p> 386:0.009999105=999.9, 358:0.00999105=999,所以, 答案都是6</p><p> 387. 一个有60人的公司为了福利员工,举办两种活动,一个为<span word="BLOODSCREEN">BLOODSCREEN</span>什么的,一个为<span word="NUTRI">NUTRI</span>什么的,参加<span word="BLOOD">BLOOD</span>的有<span word="M">M</span>人,参加<span word="NUTRI">NUTRI</span>的有<span word="N">N</span>人,都没有参加的为<span word="K">K</span>人,问都参加的有多少,最后得30好象</p>
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