借形解题是以“形”研究“数”,它使我们可以借助直观,从整体上、本质上透视问题,十分有利于问题的解决.但是,如果忽视了图形的正确性、存在性、完整性和简洁性往往会使解题陷入困境或导致错误.1注意图形的正确性例1设t0,求坐标平面上的两点A t+1t,t-1t,B(-1,0)之间的距离的最 Borrowing problem solving is to study “number” in “form”, which enables us to use intuitive, overall, and essential perspectives to solve the problem. It is very beneficial to the solution of the problem. However, if we ignore the correctness and existence of the graphic, Integrity and conciseness often make the solution difficult or lead to errors. 1 Pay attention to the correctness of the graph Example 1 Let t0, find two points on the coordinate plane A t+1t, t-1t, B(-1, 0) The distance between the most