单词trapezoidal-rule
网络: 梯形法则；梯形定则；梯形积分法
Using Trapezoidal Rule, with 4 strips, work out how much poison she should buy. And use a large, clear diagram show the solution.
利用多边形法则，利用4组数据，算出需要多少农药，用一个清晰地图示展示解答。
Usually, it is calculated approximately via trapezoidal rule, then the virtual value.
积分值与积分起始点的初相角无关，通常用梯形法则近似求出，然后求得有效值。