数学试题讨论稿第四篇（100--128）
<p> <span word="Q">Q</span>31:</p><p> <span word="A">A</span> <span word="certain">certain</span> <span word="right">right</span> <span word="triangle">triangle</span> <span word="has">has</span> <span word="sides">sides</span> <span word="of">of</span> <span word="length">length</span> <span word="x">x</span>, <span word="y">y</span>, <span word="and">and</span> <span word="z">z</span>, <span word="where">where</span> <span word="x">x</span><span word="z">z</span>. <span word="If">If</span> <span word="the">the</span> <span word="area">area</span> <span word="of">of</span> <span word="this">this</span> <span word="triangular">triangular</span> <span word="region">region</span> <span word="is">is</span> 1,</p><p> <span word="which">which</span> <span word="of">of</span> <span word="the">the</span> <span word="following">following</span> <span word="indicates">indicates</span> <span word="all">all</span> <span word="of">of</span> <span word="the">the</span> <span word="possible">possible</span> <span word="values">values</span> <span word="of">of</span> <span word="y">y</span> ?</p><p> <span word="A">A</span>. <span word="y">y</span>根号2</p><p> <span word="B">B</span>. </p><p> <span word="C">C</span>. </p><p> <span word="D">D</span>. </p><p> <span word="E">E</span>. <span word="y">y</span> </p><p> 答案为<span word="A">A</span>。<span word="Y">Y</span>最小的情况为此三角形为等腰直角三角形，此时<span word="Y">Y</span>=根号2。但是题中说<span word="Y">Y</span>大于<span word="X">X</span>，所以<span word="Y">Y</span>一定大于根号2</p><p> 102, 另外一道几何题是<span word="DS">DS</span>题，有图，三角形<span word="PQR">PQR</span>, <span word="PQ">PQ</span>和<span word="QR">QR</span>的夹角是<span word="x">x</span>. 问 <span word="PQ">PQ</span>是不是大于<span word="PR">PR</span></p><p> <span word="x">x</span>不等于60</p><p> <span word="PQ">PQ</span>=<span word="QR">QR</span></p><p> 我选的<span word="e">e</span>.</p><p> <span word="SA">SA</span>:<span word="E">E</span></p><p> 103,还有一道题是问下面哪个公式在<span word="x">x</span>0 时 等于0， 在 <span word="x">x</span>0 时等于 <span word="x">x</span>^2</p><p> 答案是：0.25</p><p> 104. 一个面积为80的像框围住一个长10宽8的相片，问像框宽度是多少?</p><p> 答案好像是6。</p><p> <span word="SA">SA</span>:<span word="WHY">WHY</span>6 ? <span word="CONFUSING">CONFUSING</span></p><p> 105, 还有一个数列1，2，4。。。。<span word="Xn">Xn</span>=2<span word="Xn">Xn</span>-1, 问第16，17，18项的和。</p><p> <span word="SA">SA</span>: 等比数列 7^15</p><p> 另外遇到了本月几经汇总里的第23，39，40，54，62，88，91</p><p> 其中第56题第2个条件给的是<span word="Ry">Ry</span>1, 所以答案是 <span word="c">c</span>.</p><p> 106. 我的第一题：-^2 =?</p>
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