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综观近三年山东高考解析几何问题都与切线相关,其中椭圆、抛物线及圆都有涉及,或需求出切线方程,或利用给出的切线方程求解,值得仔细研究和欣赏.如果使用“四线一方程”来写出切线方程求解,则会更加简洁明快.求过曲线上一点P(x0,y0)的切线方程,常可以用“四线”一方程得到,即:对于一般的二次曲线Ax2+Bxy+Cy2+Dx+Ey+F=0,用x0x代x2,用y0y代y2,
Looking at the recent three years, the Shandong Provincial College entrance examination analytic geometry problems are related to the tangent, in which the elliptical, parabolic and circular are involved, or the need for the tangent equation, or use the given tangent equation solution, it is worth careful study and appreciation. Line equation “to write the tangent equation to solve, it will be more concise and neat.Calculation of a point P (x0, y0) of the tangent equation, often can be ” four-line "an equation that: for the general The quadratic curve Ax2 + Bxy + Cy2 + Dx + Ey + F = 0, with x0x generation x2, with y0y generation y2,