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模拟卷上的一题,被b=3击败了.

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realnumber posted 2014-4-29 15:21 |Read mode
设$f(x)=ax^3-3x^2+(a-2)x+a-b,a>0,b\in R$.
(1).....
(2)若$b=3$,求函数$y=f(x),x\in [0,2]$上的单调区间.

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其妙 posted 2014-4-29 17:55
回复 1# realnumber
这是吹水区呀?发错了?

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kuing posted 2014-4-29 19:20
多余的b

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original poster realnumber posted 2014-4-29 21:37
回复 2# 其妙


    没发错,b=3没意义.文科的题目,居然还要用求根公式去分解导数,果段忽略.

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isee posted 2014-4-29 23:04
这个,不知道出题人怎么想的,估计录入错误,是a=3

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isee posted 2014-4-29 23:08
Last edited by isee 2014-4-30 00:01也吐槽一下,这是九年级数学一模的最后一题(部分,题还未完)。
真心不喜欢,这种硬生生将行列式表面积向下拿。
snap.png

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original poster realnumber posted 2014-4-29 23:55
en,也考虑过这个,但注意到是21题第2个.整张模拟卷都挺有难度的.

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isee posted 2014-4-30 00:00
回复 7# realnumber

哈哈

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