f(x)=x^2-4x+1/3
=(x-2)^2-11/3
定义域不是R吗
值域是[-11/3,正无穷)
函数f(x)=（X）平方 -4X +1/3 的定义域
函数f(x)=（X）平方 -4X +1/3 的定义域
数学人气：374 ℃时间：2019-12-17 09:02:21
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