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The problem of mathematical derivatives is a question in the college entrance examination in Henan and Hebei in 2006.
f(x)=x3-ax2+(a2- 1)
f(x)'=3x2-2ax=(3-2a)x
An increasing function represents a derivative greater than zero.
(3-2a)x & gt； 0
known
Is a subtraction function in the range of [0, 1]. If you go down, you will get the result.