GMAT数学例题详解(七)
<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> 6、1+<span word="X">X</span>+<span word="X">X</span>^2+<span word="X">X</span>^3+<span word="X">X</span>^4+<span word="X">X</span>^51/？</p><p> （1）<span word="X">X</span>0</p><p> （2）<span word="X">X</span>1</p><p> 【答案】<span word="C">C</span></p><p> 【思路】</p><p> （1）不可。因<span word="x">x</span>=1搞定。</p><p> （2）不可。</p><p> （1）（2）合起来，1-<span word="x">x</span>^20，可以。</p><p> + <span word="x">x</span>^2+<span word="X">X</span>^41/</p><p> +<span word="x">x</span>^2+<span word="x">x</span>^41</p><p> 1</p><p> + <span word="x">x</span>^41</p><p> 1-<span word="x">x</span>^4+<span word="x">x</span>^4-<span word="x">x</span>^61</p><p> 1-<span word="x">x</span>^61</p><p> 7、<span word="N">N</span>为1-99之间的整数，问满足<span word="N">N</span>被3整除的<span word="N">N</span>的概率。</p><p> 【答案】2/3</p><p> 【思路】</p><p> 1、2、3中，2、3两个数符合条件<span word="n">n</span>能被3整除的条件，由于3个数一循环，所以比例为2/3。</p><p> 8、五角星的五个顶角之和？</p><p> 【答案】180度</p><p> 【思路】</p><p> 根据三角形任意外角=不相邻两内角得和，可以把五角星的五个角归集到一个三角形里三角和=180。</p><p> 9、从<span word="X">X</span>-<span word="Y">Y</span>，<span word="X">X</span>+<span word="Y">Y</span>，<span word="X">X</span>-5<span word="Y">Y</span>，<span word="X">X</span>+5<span word="Y">Y</span>中任选两个，能组成<span word="X">X</span>^2-<span word="DY">DY</span>^2（<span word="D">D</span>为某一数值）的概率是多少？</p><p> 【答案】1/3</p><p> 【思路】</p>
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