化简[a/(a-1)-2/(a-1)]÷(1-1/a+1)
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化简[a/(a-1)-2/(a-1)]÷(1-1/a+1)化简[a/(a-1)-2/(a-1)]÷(1-1/a+1)化简[a/(a-1)-2/(a-1)]÷(1-1/a+1)=(a-2)/(a-1)*
化简[a/(a-1)-2/(a-1)]÷(1-1/a+1)
化简[a/(a-1)-2/(a-1)]÷(1-1/a+1)
化简[a/(a-1)-2/(a-1)]÷(1-1/a+1)
=(a-2)/(a-1)*(a+1)/a
=(a-2)/(a-1)*(a+1)(a-1)/a(a-1)
=(a-2)(a+1)/a
=a-1-2/a
化简：[(a-2)/(a²+2a)-(a-1)/(a²+4a+4)]÷(a-4)/(a+2)
化简:｛(a+2/a²-2a)-(a-1/a²-4a+4)｝÷(a-4/a)
化简：(a/a-1-2a-1/a-1)÷a-1/a+2
化简a-1/a²+4a+4÷1-a/a²+2a
化简(a-5)(a+1)/a^2-5a÷(a^2+a)
【1】a+a=a×a a= [ ]【2】a×a=a÷a a=[ ]【3】a×a=a－a a=[ ] [4]a－a=a＋a a=[ ]
化简 a/a-1 - a-1/a+2÷a²-1/ a²+4a+4
化简：(a-a/a+1)÷（a²-2a）/（a²-4）×1/(a+2)
(1-16a×a×a×a)÷（4a×a+1)÷(2a+1)²
(1-16a×a×a×a)÷(4a×a+1)÷(2a+1)
[a/(a-1)+a/(a+2)](a+2)/(2a平方+3a+1)化简
[(a/a-2)-(a/a+2)]÷4a/2-a,其中a=-1/2
化简：(1-a)^2/a-1 (a
[a-a/(a+1)]÷(a²-2a)/(a²-4)×(a+1)/(a²+4a+4)
化简2a(a-1/2)+a
化简:-a+a/a+1
（2+1/a-1-1/a+1）÷（a-a/1-a²）化简
化简：(a^2-a)÷(a^2-2a+1)/(a-1)