题目

(本小题满分12分) 已知函数f(x)= x2 + alnx(a为常数,a∈R),g(x)= f(x)- x3; (1)讨论函数f(x)的单调性; (2)当a = 1 时,判断函数g(x)的零点的个数,并说明理由。 答案:解析—_______ are you staying there?   —For about two weeks.     [     ]A. How long           B. How old    C. How               D. How much
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