Some Calculus Applications一些微积分应用
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Average of a Function函数的平均值
If a function f(x) is a simple straight line of maximum value A on an interval T, then the average over an interval T is just A/2. 如果函数f(x)在一个区间T内是一个最大值为A的简单直线,则在该区间内的平均值就是A/2。
![]() If the function is more complex, then you can apply the idea that the average value of the function favg multiplied times the interval T will be equal to the area under the function curve. This is where the idea of the integral becomes significant. The integral can be viewed as the area under the function curve. 如果函数更复杂,那么你可以应用这样一个想法:函数 f 的平均值乘以时间间隔 T 等于函数曲线下的面积。这就是积分概念的重要性所在。积分可以被视为函数曲线下的面积。
![]() The use of an integral to obtain the average of a function is a powerful and useful technique. It can be illustrated using the simple function above. 使用积分来求得函数的平均值是一种强大且有用的技术。可以借助上述简单的函数来说明这一方法。
![]() The integral used here is of the polynomial type. 这里使用的积分是多项式类型的。
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