【摘要】 定积分的计算通常用换元法求出原函数,然后使用牛顿-莱布尼兹公式求出结果.但对于被积函数的原函数无法用初等函数表达的情况下,却无能为力.如果由奇偶函数在对称区间上定积分的基本性质出发,经过变换被积函数变形,进而推广到一般情形,那么就可得到计算这种定积分的重要方法,以此来解决用常法无法计算的定积分问题.更多还原

【Abstract】 The result of definite integrals is often calculated by conversion method and Newton-Leibniz formula.However,if the primitive function of integrand cannot be indicated by elementary function,the method above cannot be fit.We can explain it from the basic properties,and then change the structure of the integrand,and then we can get an important solution to definite integral,which can solve many abnormal definite integral problems.更多还原