导数的应用在高考考查中越来越受到重视,其中有一类是考查切线问题,一般解决与曲线y=f(x)切线有关问题时,可先设出切点坐标Q(x0,y0),然后运用切点坐标的“一拖三作用”解题,即:切线的斜率为k=f’(x0);切点 The application of derivatives in the college entrance examination is more and more emphasized. One of them is to examine the tangent problem. Generally, when solving problems related to the tangent line of the curve y=f(x), the tangent coordinates Q(x0, y0) can be set first, and then Use the “one drag and three action” problem of tangent coordinates to solve the problem, that is, the slope of the tangent line is k = f’(x0);