GMAT考试数学辅导11月数学总结(二)
<p> 17. 我的第三题，六张纸牌，编号1到6，随机抽出一张，再放回，再抽出一张，两次加在一起为8的情况下，其中一张编号为5的概率?</p><p> 作者答案及思路：3、5， 5、3，4、4，4、4，2、6，6、2 其实应该是5种情况，2次4，4其实都是一样的，不能算成2次，所以此题答案为2/5。</p><p> 18. 三个数算术平均数为39，<span word="Median">Median</span>是48。求最小数的最大值。</p><p> 作者答案及思路：我的答案是21。</p><p> 19. 想起那道唯一的老机井了：6个队每队出三个代表，互相握手但同队的人不握手，一共要握几次手?</p><p> 作者答案及思路：</p><p> <span word="remeo">remeo</span>评价意见：应该是<span word="C">C</span>-6<span word="C">C</span>=135</p><p> 20. 一个三角形，求周长</p><p> 是等腰</p><p> 已知某两边长的和为20 <span word="E">E</span></p><p> 21.<span word="A">A</span> <span word="company">company</span> <span word="can">can</span> <span word="produce">produce</span> <span word="item">item</span> <span word="A">A</span> <span word="with">with</span> <span word="no">no</span> <span word="more">more</span> <span word="than">than</span> 800 <span word="per">per</span> <span word="day">day</span> <span word="and">and</span> <span word="item">item</span> <span word="B">B</span> <span word="no">no</span> <span word="more">more</span> <span word="than">than</span> 400 <span word="per">per</span> <span word="day">day</span>. <span word="If">If</span> <span word="the">the</span> <span word="company">company</span> <span word="can">can</span> <span word="see">see</span> <span word="product">product</span> <span word="A">A</span> $10 <span word="profit">profit</span> <span word="each">each</span> <span word="and">and</span> <span word="sell">sell</span> <span word="product">product</span> <span word="B">B</span> $4 <span word="profit">profit</span> <span word="each">each</span>. <span word="The">The</span> <span word="company">company</span> <span word="can">can</span> <span word="sell">sell</span> <span word="no">no</span> <span word="more">more</span> <span word="than">than</span> 1000 <span word="items">items</span> <span word="each">each</span> <span word="day">day</span>. <span word="Which">Which</span> <span word="is">is</span> <span word="the">the</span> <span word="following">following</span> <span word="can">can</span> <span word="make">make</span> <span word="the">the</span> <span word="company">company</span> <span word="have">have</span> <span word="the">the</span> <span word="maximum">maximum</span> <span word="profit">profit</span> <span word="per">per</span> <span word="day">day</span>.</p><p> 1. 900 <span word="A">A</span>, <span word="and">and</span> 100 <span word="B">B</span></p><p> 2. 800 <span word="A">A</span>, <span word="and">and</span> 200 <span word="B">B</span></p><p> 3. 700 <span word="A">A</span>, <span word="and">and</span> 300 <span word="B">B</span></p><p> 4. 600 <span word="A">A</span>, <span word="and">and</span> 400 <span word="B">B</span></p>
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