摘要：數學與生活,特別是經濟生活,有著千絲萬縷的聯系.在我們的日常生活中，數學已不再是單純的用作計數或統計,還常用于經濟生活決策中.比如說股市,炒股不僅需要精明的經濟頭腦和良好的心理素質,更需要一定的數學知識,分析、綜合、推理、計算和決策,數學無時無刻不在顯示它在股市中的作用.本文運用相關數學知識,結合實例分析股市中三種常見的股票指數的計算方法,以幫助人們在投資生活中更好地認識和利用股票指數.

關鍵字：數學； 股票； 指數； 方法

Abstract：Mathematics and life, especially in economic life, are inextricably linked.In our daily life, mathematics is no longer a simple as a count or statistics, but also commonly used in the economic life decision-making.For example, the stock market, stocks requires not only a shrewd economic sense and good psychological quality, but require a certain amount of mathematical knowledge, analysis, synthesis, reasoning, calculation  and  decision-making, mathematics all the time to show it in the stock market . This paper use the related mathematical knowledge, combined with examples to analyzes the three common stock index calculation method in stock market, and help people better understanding and using the stock index in the investment in life .

Key words：mathematics; stock ; index; method