09月数学试题讨论稿第二篇（41--65）
<p> 41、<span word="GWD">GWD</span> 6-37 42、<span word="A">A</span>、<span word="B">B</span>两个学生与其他3个学生坐成一排，问中间要么坐<span word="A">A</span>要么坐<span word="B">B</span>的排列数 <span word="SA">SA</span>: 没有很理解题意 我的做法是 <span word="PP">PP</span>=48</p><p> 43、长方形面积为4倍根3，宽为对角线的一半，问对角线长度</p><p> <span word="SA">SA</span>:4 对角线 宽 长构成 <span word="a">a</span> 根3<span word="a">a</span> 2<span word="a">a</span></p><p> 42.车行买一次算5,卖一次算3,最后车总数是14,求买卖共几次.</p><p> <span word="feifei">feifei</span>七：39、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> 流沙：设买入的次数是<span word="x">x</span>，卖出的次数是<span word="y">y</span>，则5<span word="x">x</span>-3<span word="y">y</span>=14。<span word="x">x</span>= /5, 3<span word="y">y</span>的个位数必须是6或者1，所以<span word="y">y</span>=2，12，27等等。根据选项，<span word="y">y</span>只能为2，<span word="x">x</span>=4。选<span word="D">D</span></p><p> 45、老<span word="JJ">JJ</span>：退休占全部人员60%，其中20%参加了健康计划，健康计划的人占48%，问健康计划人里退休人员所占比例</p><p> <span word="SA">SA</span>:60%20%/48%=25%</p><p> 46、中号红衬衣所售数量是大号白衬衣的2倍，中号白衬衣是大号白的3倍，红卖了80，白卖了190，问共卖了多少中号的</p><p> <span word="SA">SA</span>: 应该是这样的题：见稿三80</p><p> 80. 一个店 <span word="sell">sell</span> <span word="medium">medium</span> <span word="and">and</span> <span word="large">large</span> 红衬衫还有<span word="medium">medium</span> <span word="and">and</span> <span word="large">large</span>白衬衫. <span word="It">It</span> <span word="sold">sold</span> <span word="twice">twice</span> <span word="as">as</span> <span word="many">many</span> <span word="medium">medium</span> <span word="red">red</span> <span word="shirts">shirts</span> <span word="as">as</span> <span word="large">large</span> <span word="white">white</span> <span word="shirts">shirts</span> <span word="and">and</span> 3 <span word="times">times</span> <span word="as">as</span> <span word="many">many</span> <span word="medium">medium</span> <span word="white">white</span></p>
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