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# 2.1 绘制一个二次函数并用梯形法求积分
## (1). 解题思路
当给定一个二次函数后，在`x`范围内取`n`等分，然后每一份组成的梯形可以通过用直线绘制梯形的上下底以及斜边画出，最后利用梯形求面积公式求出这一个梯形的面积，全部梯形面积累加和极为所求积分。
## (2). 运行结果
