三角形和梯形中位线定理不仅反映了图形间线段的位置关系,而且还揭示了线段间的数量关系,用它不但可以解决线段的和差、倍分、相等问题,还可以起到“桥梁”作用.在证明线段之间的某些不等关系更是尤为重要.因此对涉及线段中点的问题利用中位线解题更有效.结合例题,浅析应用. The triangle and trapezoidal median line theorem not only reflects the positional relationship between the lines of the graph, but also reveals the relationship between the number of line segments. Using it not only can solve the problem of line segment differences, multiples, and equals, but also can act as a “bridge”. Role. It is particularly important to prove some inequality between line segments. Therefore, it is more effective to use the median line to solve the problem involving the midpoint of the line segments.