平面直角坐标系中,三个顶点都在抛物线上并且三边都不在两坐标轴上的三角形面积的最大值问题,近几年高频率地出现在中考题中,本文向同学们介绍两种解法.垂线法,是指过三角形顶点向x轴作垂线,将三角形的面积化成两个图形面积和或差的形式.一般情况下,坐标系中求三角形面积时,三角形 Plane Cartesian coordinate system, the three vertices are in the parabola and the three sides are not on both axes of the triangular area of ​​the maximum problem, in recent years, high frequency appeared in the test questions, this article to the students introduced two kinds of solutions The vertical line method refers to the vertex of the triangle is perpendicular to the x axis and the area of ​​the triangle is transformed into the form of area or difference between two figures.Generally, when the area of ​​the triangle is found in the coordinate system, the triangle