先简化再评价广东考题 很简单，a？-1/a？-2a+1 =(a+1)(a-1)/(a-1)？a+1/a3-a？=a+1/a？(a-1)原公式= =(a+1)(a-1)/(a-1)？乘以a？(a-1)/a+1=a？放a=√3代替=3