;化简求值,{【(a方+2a)分之(a-2)】-【(a方+4a+4)分之(a-1)】}除以(a+2)分之(a-4),

问题描述:

;化简求值,{【(a方+2a)分之(a-2)】-【(a方+4a+4)分之(a-1)】}除以(a+2)分之(a-4),
其中a满足:a方+2a-1=0

((a-2)/(a²+2a)-(a-1)/(a²+4a+4))/(a-4/a+2)=((a-2)/(a²+2a)-(a-1)/(a+2)²)*(a+2)/(a-4)=((a-2)/a-(a-1)/(a+2))/(a-4)=((a²-4)-(a²-a))/a(a+2)...