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问题(武汉市2007年高三二月模拟考试理科数学第21题)已知函数f(x)=x~2 +2x+alnx.(1)若函数f(x)在区间(0,1]上恒为单调函数,求实数a的取值范围;
Question (Wuhan City, 2007 Senior Three-month simulation test mathematics Question 21) Known function f (x) = x ~ 2 + 2x + alnx. (1) If the function f (x) in the interval (0,1) The constant is a monotonic function, and the range of the real number a is obtained.