（a-2/a2+2a-a-1/a2+4a+4)/a-4/a+2,其中a满足a2+2a=1

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（a-2/a2+2a-a-1/a2+4a+4)/a-4/a+2,其中a满足a2+2a=1
（a-2/a2+2a-a-1/a2+4a+4)/a-4/a+2,其中a满足a2+2a=1

（a-2/a2+2a-a-1/a2+4a+4)/a-4/a+2,其中a满足a2+2a=1
(a-2)/(a+2a)-(a-1)/(a+4a+4)-(a-4)/(a+2).[猜着修改的] =(a-2)/(a+2a)-(a-1)/(a+4a+4)-(a-4)/(a+2) =(a-2)/a(a+2)-(a-1)/(a+2)-(a-4)/(a+2) =(a-4)/a(a+2)-a(a-1)/a(a+2)-(a-4)/(a+2) =(a-4)/a(a+2)-(a-4)/(a+2) =(a-4)[1/a(a+2)-(a+2a)/a(a+2)] =(a-4)[1/a(a+2)-1/a(a+2)] =(a-4)×0 =0

已知a2-a-6=0,则a2-2(a2-a+3)-1/2(a2-a-4)-a 化简a2+2a/4-a2 (a2-1)/(a2+2a+1)除以(a2-a)/(a+1) (a-2/(a+3)除以(a2-4)/(a2+6a+9) 15a2-{-4a2+[5a-8a2-（2a2-a）]+9a2-3a}2是平方 已知实数a满足a2+2a-1=0求(1 /a+1)-(a+3/a2-1)*(a2-2a+1/a2+4a+3)的值 a3-a2-a+1/a2-2a+1化简 (a2+a+1)(a2+a+2)-12因式分解 化简：｛(a2-4a+4)/(a2+2a+1)｝× ｛（a+1）/（a²-4）｝ 2a2-4a 因式分解 （a2-4/a2-4a+3）×（a-3/a2+3a+2=? 设a=根号3-3,求[(a+1/a2-a)+(4/1-a2)]除以(a2+2a-3/a2+3a)的值 （a-2/a2+2a-a-1/a2+4a+4)/a-4/a+2,其中a满足a2+2a=1 因式分解：（a2+1）2-4a（a2+1）+4a2 (a2-3a+2)x2+(2a2-4a+1)xy+(a2-a)y2因式分解如题 (a+2)(a-2)-(1-a2) 若a满足(a2+a+1)^-2 ( a2-9)/(a2+6a+9) ÷(a-3) /(a2+3a) - (a-a2) /(a2-1), |4+2a|/根号a2+1=?