1 g(x)'=2a^2x-1/x=2x-1单调递增[1+2,+无穷) 递减区间(0,1/2)
(2)h(x)=-a^2x^2+ax+inx h(x)'=-2a^2x+a+1/x
令 h(x)'=-2a^2x+a+1/x ≥0 得 0