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1一则答疑案例在高三复习课讲完“导数在函数中的应用”一节内容后,学生吴云艳在教室前的走廊上问了这样一道题目:设三次函数f(x)=ax3+bx2+cx+d(a>b>c)在x=1处取得极值,其图像在x=m处的切线斜率为-3a.
1 answering a case in the senior high school review finished “section in the function of the application of ” section, the student Wu Yunyan asked in the corridor in front of the classroom such a topic: set the third function f (x) = ax3 + bx2 + cx + d (a> b> c) Take the extreme value at x = 1 whose tangent slope at x = m is -3a.