GRE数学题每日一练（九）
<p> 1、<span word="perpendicular">perpendicular</span> 题，<span word="y">y</span>=<span word="ax">ax</span>+ <span word="and">and</span> <span word="y">y</span>=<span word="bx">bx</span>+</p><p> <span word="ab">ab</span> <span word="and">and</span> 1</p><p> 2、<span word="the">the</span> <span word="two">two</span> <span word="words">words</span> <span word="choose">choose</span> <span word="one">one</span> <span word="letter">letter</span> <span word="from">from</span> <span word="each">each</span> <span word="of">of</span> <span word="the">the</span> <span word="two">two</span> <span word="words">words</span></p><p> 两个单词各从其中取出一个字母，问相同字母的概率!!! 3/16</p><p> 3、-32 -54</p><p> 问 的范围 <span word="sure">sure</span></p><p> 4、买玩具，从<span word="A">A</span> <span word="and">and</span> <span word="B">B</span> 中各选一个 <span word="A">A</span> <span word="toy">toy</span>五个中挑四个 <span word="B">B</span> <span word="toy">toy</span> 五个中挑三个 问有多少种可能? 50</p><p> 5、<span word="standard">standard</span> <span word="deviation">deviation</span> 10 20 50 80 100 <span word="and">and</span> 10 30 50 70 100 比大小，看清楚题再答!!!</p><p> 6、0 <span word="a">a</span></p><p> 7、 <span word="some">some</span> <span word="dongdong">dongdong</span> 第一次卖<span word="at">at</span> 20% <span word="decrease">decrease</span> <span word="of">of</span> <span word="the">the</span> <span word="listed">listed</span> <span word="price">price</span>， 第二次卖 <span word="at">at</span> 40% <span word="decrease">decrease</span> <span word="of">of</span> <span word="the">the</span> <span word="listed">listed</span> <span word="price">price</span> <span word="question">question</span>: <span word="the">the</span> <span word="ratio">ratio</span> <span word="of">of</span> <span word="the">the</span> <span word="second">second</span> <span word="price">price</span> <span word="to">to</span> <span word="the">the</span> <span word="first">first</span> <span word="price">price</span> <span word="my">my</span> <span word="key">key</span>: 3/4</p><p> 8、坐标系中有一三角形，三点坐标， <span word="and">and</span> ， <span word="the">the</span> <span word="area">area</span> <span word="of">of</span> <span word="the">the</span> <span word="triangle">triangle</span></p><p> 简单算法： 作两条关于<span word="x">x</span> <span word="and">and</span> <span word="y">y</span>的平行线，你会发现这个图形由一正方形和梯形构成，减去其中不必要的部分，，答案：13-4-2=7</p><p> 9、坐标系，以圆点为圆心作圆，第一象限的圆上有两点 <span word="and">and</span></p><p> <span word="a">a</span>+<span word="b">b</span> <span word="and">and</span> <span word="c">c</span>+<span word="d">d</span> 比大小 <span word="d">d</span></p><p> 因为 ^2 <span word="and">and</span> ^2 = = <span word="radius">radius</span>^2</p><p> <span word="so">so</span> 2<span word="ab">ab</span> <span word="and">and</span> 2<span word="cd">cd</span> <span word="are">are</span> <span word="difficult">difficult</span> <span word="to">to</span> <span word="compare">compare</span>、</p><p> 10、一个圆弧，圆心角90，求所对的弧的大小 3/2 、</p>
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