f(x) = x² - 2x - 5
= (x - 1)² - 6
当 x = 1 时 ,
最小值 = f(1) = -6
当 x = 3 时,
最大值 = f(3) = -2
所以值域是 [-6 ,-2]
已知函数f(x)=x的平方-2x-5,x属于[0,3],则f（x)的值域是多少
已知函数f(x)=x的平方-2x-5,x属于[0,3],则f（x)的值域是多少
数学人气：826 ℃时间：2020-05-11 15:22:22
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