GMAT数学辅导：算术知识点全解析(比率、比例、百分比)
<p> <span word="GMAT">GMAT</span>数学辅导：算术知识点全解析</p><p> 五.比率与比例：<span word="ratio">ratio</span> <span word="and">and</span> <span word="proportion">proportion</span></p><p> 一个比率<span word="ratio">ratio</span>可以表示成许多方式，例如：<span word="the">the</span> <span word="ratio">ratio</span> <span word="of">of</span> 2 <span word="to">to</span> 3可以被表达为2 <span word="to">to</span> 3，2：3，或者2/3。注意比率中的中项的顺序是重要的，即2 <span word="to">to</span> 3和3 <span word="to">to</span> 2不同。<span word="A">A</span> <span word="proportion">proportion</span> <span word="is">is</span> <span word="a">a</span></p><p> <span word="statement">statement</span> <span word="that">that</span> <span word="two">two</span> <span word="ratios">ratios</span> <span word="are">are</span> <span word="equal">equal</span>。例如：2/3=8/12是一个<span word="proportion">proportion</span>。</p><p> 六.百分比：<span word="percent">percent</span></p><p> <span word="Percent">Percent</span> <span word="means">means</span> <span word="per">per</span> <span word="hundred">hundred</span> <span word="or">or</span> <span word="number">number</span> <span word="out">out</span> <span word="of">of</span> 100。</p><p> 在考题中经常会问到从某一数量到另一数量百分比的增加或减少。首先算出增加或减少的量，然后除以原来的那个量，即<span word="from">from</span>或<span word="than">than</span>后面的量。</p><p> </p>
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