GMAT数学例题详解(十四)
<p> 下面<span word="GMAT">GMAT</span>思为大家整理了<span word="GMAT">GMAT</span>数学例题详解，供考生们参考，以下是详细内容。</p><p> 16、坐标图上画出两根线段，相交于一点，求这点的坐标。两根线段的另一头分别为（0，0）和（5，3），线段1的<span word="SLOPE">SLOPE</span>为1/8，线段2的<span word="SLOPE">SLOPE</span>为2/5。</p><p> 【答案】</p><p> 【思路】已知一点做标与斜率可得出直线方程, 分别为:<span word="y">y</span>=1/8<span word="x">x</span> <span word="y">y</span>=2/5<span word="x">x</span>+1解方程组即为交点坐标.</p><p> 17、</p><p> <span word="O">O</span></p><p> <span word="X">X</span> <span word="X">X</span></p><p> <span word="X">X</span> <span word="X">X</span> X</p><p> <span word="X">X</span> <span word="X">X</span> X X</p><p> <span word="X">X</span> <span word="X">X</span> X X X</p><p> 凹凹凹凹</p><p> 上图的第一行的<span word="O">O</span>表示一个小球。第2、3、4行的<span word="X">X</span>表示障碍物。第6行的凹表示小凹槽。小球从上落下，掉到第3行时受中间的障碍物阻滞，会向左或向右的机率是各百分之五十。以下亦然。</p><p> 问：最后掉到第6行的第二个小凹槽的机率有多大？</p><p> 【答案】3/8</p><p> 【思路】画图作吧.</p><p> <span word="O">O</span></p><p> <span word="X">X</span> <span word="X">X</span></p><p> <span word="X">X</span> <span word="X">X</span> X</p><p> <span word="X">X</span> 1/2 1/2 <span word="X">X</span></p><p> <span word="X">X</span> 1/4 1/4+1/4 1/4 <span word="X">X</span></p><p> 凹 1/8+1/4 凹 凹</p><p> 18、五个数：<span word="X">X</span>，<span word="Y">Y</span>，<span word="Z">Z</span>，5，7，他们的算术<span word="mean">mean</span> <span word="is">is</span> 8，下面那个对？</p>
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