新GRE《OG》数学题精选及答案（1）
<p> 新<span word="GRE">GRE</span>数学难吗?<span word="GRE">GRE</span>考试网推荐新<span word="GRE">GRE</span>《<span word="OG">OG</span>》数学题精选，并附参考答案，让考生们了解<span word="GRE">GRE</span>数学的题型,以及考试的知识点。祝考生们取得良好成绩!</p><p> <span word="The">The</span> <span word="figure">figure</span> <span word="above">above</span> <span word="shows">shows</span> <span word="the">the</span> <span word="graph">graph</span> <span word="of">of</span> <span word="a">a</span> <span word="function">function</span> <span word="f">f</span>, <span word="defined">defined</span> <span word="by">by</span> <span word="f">f</span>=|2<span word="x">x</span>|+4</p><p> <span word="for">for</span> <span word="all">all</span> <span word="numbers">numbers</span> <span word="x">x</span>. <span word="For">For</span> <span word="which">which</span> <span word="of">of</span> <span word="the">the</span> <span word="following">following</span> <span word="functions">functions</span> <span word="g">g</span> <span word="defined">defined</span> <span word="for">for</span> <span word="all">all</span></p><p> <span word="numbers">numbers</span> <span word="x">x</span> <span word="does">does</span> <span word="the">the</span> <span word="graph">graph</span> <span word="of">of</span> <span word="g">g</span> <span word="intersect">intersect</span> <span word="the">the</span> <span word="graph">graph</span> <span word="of">of</span> <span word="f">f</span> ?</p><p> <span word="A">A</span> <span word="g">g</span>=<span word="x">x</span>2</p><p> <span word="B">B</span> <span word="g">g</span>=<span word="x">x</span>+3</p><p> <span word="C">C</span> <span word="g">g</span>=2<span word="x">x</span>2</p><p> <span word="D">D</span> <span word="g">g</span>=2<span word="x">x</span>+3</p><p> <span word="E">E</span> <span word="g">g</span>=3<span word="x">x</span>2</p><p> 这个题就是问两个函数图象相交的问题，根据观察，要与这个折线相交的直线的斜率满足的条件是要么是正斜率比2大，要么是负斜率比-2小，因此只能选<span word="E">E</span>了。</p><p> </p>
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