GMAT数学基本概念汇总小结
<p> 分数：<span word="fractions">fractions</span></p><p> 分子：<span word="numerator">numerator</span></p><p> 分母：<span word="denominator">denominator</span></p><p> 分数的加减乘除：<span word="addition">addition</span>，<span word="subtraction">subtraction</span>，<span word="multiplication">multiplication</span> <span word="and">and</span> <span word="division">division</span> <span word="of">of</span> <span word="fractions">fractions</span></p><p> 繁分数和假分数：<span word="mixed">mixed</span> <span word="number">number</span> <span word="and">and</span> <span word="improper">improper</span> <span word="fraction">fraction</span></p><p> 繁分数是指一个数由一个整数和一个分数构成。</p><p> 假分数是指分子大于分母的分数。例如：7/3</p><p> 小数：<span word="decimals">decimals</span></p><p> 科学计数法：<span word="scientific">scientific</span> <span word="notation">notation</span></p><p> <span word="Sometimes">Sometimes</span> <span word="decimals">decimals</span> <span word="are">are</span> <span word="expressed">expressed</span> <span word="as">as</span> <span word="the">the</span> <span word="product">product</span> <span word="of">of</span> <span word="a">a</span> <span word="number">number</span> <span word="with">with</span> <span word="only">only</span> <span word="one">one</span> <span word="digit">digit</span> <span word="to">to</span> <span word="the">the</span> <span word="left">left</span> <span word="of">of</span> <span word="the">the</span> <span word="decimal">decimal</span> <span word="point">point</span> <span word="and">and</span> <span word="a">a</span> <span word="power">power</span> <span word="of">of</span> 10. <span word="This">This</span> <span word="is">is</span> <span word="called">called</span> <span word="scientific">scientific</span> <span word="notation">notation</span>. <span word="For">For</span> <span word="example">example</span>, 231 <span word="can">can</span> <span word="be">be</span> <span word="written">written</span> <span word="as">as</span> 2.31102 <span word="and">and</span> 0.0231 <span word="can">can</span> <span word="be">be</span> <span word="written">written</span> <span word="as">as</span> 2.3110-2. <span word="When">When</span> <span word="a">a</span> <span word="number">number</span> <span word="is">is</span> <span word="expressed">expressed</span> <span word="in">in</span> <span word="scientific">scientific</span> <span word="notation">notation</span>, <span word="the">the</span> <span word="exponent">exponent</span> <span word="of">of</span> <span word="the">the</span> 10 <span word="indicates">indicates</span> <span word="the">the</span> <span word="number">number</span> <span word="of">of</span> <span word="places">places</span> <span word="that">that</span> <span word="the">the</span> <span word="decimal">decimal</span> <span word="point">point</span> <span word="is">is</span> <span word="to">to</span> <span word="be">be</span> <span word="moved">moved</span> <span word="in">in</span> <span word="the">the</span> <span word="number">number</span> <span word="that">that</span> <span word="is">is</span> <span word="to">to</span> <span word="be">be</span> <span word="multiplied">multiplied</span> <span word="by">by</span> <span word="a">a</span> <span word="power">power</span> <span word="of">of</span> 10 <span word="in">in</span> <span word="order">order</span> <span word="to">to</span> <span word="obtain">obtain</span> <span word="the">the</span> <span word="product">product</span>. <span word="The">The</span> <span word="decimal">decimal</span> <span word="point">point</span> <span word="is">is</span> <span word="moved">moved</span> <span word="to">to</span> <span word="the">the</span> <span word="right">right</span> <span word="if">if</span> <span word="the">the</span> <span word="exponent">exponent</span> <span word="is">is</span> <span word="positive">positive</span> <span word="and">and</span> <span word="to">to</span> <span word="the">the</span> <span word="left">left</span> <span word="if">if</span> <span word="the">the</span> <span word="exponent">exponent</span> <span word="is">is</span> <span word="negative">negative</span>. <span word="For">For</span> <span word="example">example</span>, 20.13103 <span word="is">is</span> <span word="equal">equal</span> <span word="to">to</span> 20,130 <span word="and">and</span> 1.9110-4 <span word="is">is</span> <span word="equal">equal</span> <span word="to">to</span> 0.000191.</p><p> </p>
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