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强大的应试心理于考试的重要性无须赘述.基于考试而主张高中数学的解题训练,关注应试心理的强大,其意义与价值同样也无须赘述.案例[2013年高三毕业班质检龙岩卷·理20]已知函数f(x)=x~3+cx+d的图象C在点A(0,d)处的切线l的方程是x+y-1=0.(Ⅰ)略;(Ⅱ)对于任意非零实数x_1,曲线C在点P(x_1,f(x_1))处的切线l_1与l相交于点M,与曲线C相交于点Q(x_2,f(x_2));曲线C在点Q(x_2,f(x_2))处的切线l_2与l相交于点N,问:(?)是否为定值,并证明你的结论;(Ⅲ)略.
Strong psychological test in the importance of the exam Needless to say .Based on the examination and advocated high school mathematics problem solving training, attention to the strong psychology, the significance and value of the same need not go into details. [2013 senior high school graduates quality inspection Longyan (20) It is known that the equation of tangent line l at point A (0, d) of image C of the function f (x) = x ~ 3 + cx + d is x + y-1 = (Ⅱ) For any nonzero real number x_1, tangent lines l_1 and l at curve C at point P (x_1, f (x_1)) intersect at point M and intersect curve C at point Q (x_2, f (x_2)); The tangent line l_2 and l of curve C at point Q (x_2, f (x_2)) intersect at point N, and ask whether: (?) Is a fixed value and prove your conclusion;