在解证题中,常常会遇到在一些条件下,求最值或证明不等式,其解证往往难以入手.若能把它们转化为几何中的点线问题,充分利用有关的几何性质、定理,常可使问题很易获解.1.利用圆的切线方程解最值题 In the problem-solving problem, it is often encountered under some conditions, to find the best value or to prove inequality, the solution is often difficult to get started. If you can turn them into the problem of the dotted line in geometry, make full use of the relevant geometric properties, theorems , Often the problem is easily solved. 1. Use the tangent equation of the circle to solve the problem