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对称性在定积分计算中的应用
引用本文:许永立.对称性在定积分计算中的应用[J].数学学习,2013(6):25-26,29.
作者姓名:许永立
作者单位:西北工业大学明德学院教学部,陕西西安710124
摘    要:设f(x)和g(x)在a,b]上连续,f(x)关于点((a+b)/2,c)对称,g(x)关于直线x=(a+b)/2对称,根据定积分的性质,通过变量代换,可证∫a ^bf(x)g(x)dx=c∫a^bg(x)dx,,该结论及其推论可用以简化定积分计算,实例说明其应用.

关 键 词:对称性  定积分  变量代换

Evaluating Definite Integrals with Symmetry
XU Yongli.Evaluating Definite Integrals with Symmetry[J].Studies In College Mathematics,2013(6):25-26,29.
Authors:XU Yongli
Institution:XU Yongli (Education Department, Northwestern Polytechnical University Mingde College, Xi ' an 710124, PRC)
Abstract:Suppose f(x) and g(x) are continUous on a,b], f(x) is symmetric with respect to the point ((a+b)/2,c), and g(x) is symmetric with respect to the line x = (a+b)/2. We prove that dx = c ag(x)dx. Examples are illustrated to show the usefulness of this result.
Keywords:symmetry  definite integral  variable substitution
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