a-1分之a除以a平方-1分之a平方-a-a-1分之1

=a(1-a)/(a+1)(a-1)×(a-1)/a×(a+1)²/(a-1)²=-(a+1)/(a-1)再问：最后结果是一(a1)分之(a-1)吗?再答：是负的(a-1)分之(a

(a-1)/(a^2-4a+4)÷(1-a)/(a^2-4)=(a-1)/(a-2)^2*(a^2-4)/(1-a)=-(a-1)/(a-2)^2*(a^2-4)/(a-1)=-1/(a-2)^2*(

（a-1分之a+1+a的平方-2a+1分之1)除以a-1分之a=[(a+1)/(a-1)+1/(a-1)²]×(a-1)/a=[(a+1)(a-1)/(a-1)²+1/(a-1)&

您好：原式=（a²-a²+b²-1）/a*a/(b-1)*1/(a+b)=(b²-1)*1/(b-1)*1/(a+b)=(b+1)(b-1)*1/(b-1)*1

[1-1/(a+1)]/[(a^2-a)/(a+1)]=[a/(a+1)]/[a(a-1)/(a+1)]=1/(a-1)

用到的公式(x+y)²=x²+2xy+y²(x-y)²=x²-2xy+y²(x+y)(x-y)=x²-y²(a+b分之a

   【（A的平方分之A+1）-A+1】除以A分之A的平方-1=[a+1-a²(a+1）]/a²÷(a²-1)/a=(1-a²)(

[1--1/(a+1)]/a^2--1/a=[(a+1)--1]/a^2(a+1)--1/a=1/a(a+1)--1/a=[(a+1)--1]/a(a+1)=1/(a+1)不懂可以继续追问,

[1-1/(a-1)]÷[(a^2-4)/(a^2-2a+1)(a+2)]=[1-1/(a-1)]÷[(a-2)(a+2)/(a^2-2a+1)(a+2)]=[1-1/(a-1)]÷[(a-2)/(a

(1/a-1)÷(a^2-1)/(a^2+a)=(1/a-1)÷[(a-1)(a+1)/a(a+1)]=(1-a)/a÷[(a-1)/a]=(1-a)/a*a/(a-1)=-(a-1)/a*a/(a-

(a-1/a)÷【(a²-2a+1)/a】=【（a²-1)/a】÷【（a-1)²/a】=【（a+1)（a-1)/a】*【a/（a-1)²】=(a+1)/(a-1

{1+4/（a²-4）}÷a/(a-2)=(a²-4+4)/（a²-4））÷a/(a-2)=a²/{（a+2）(a-2)}×(a-2)/a=a/2+2

a∧3-2a∧2+1／a∧4+a∧2-2a+1再问：符号不太清楚再答：你的是整体的平方吗a分之1-a平方是整体的吗是的话a立方-2a平方+1除以a四次方+a方-2a+1再问：不是，是÷a²+

（2+a-1分之1-a+1分之1）除以（a-1-a平方分之a)=[2+1/(a-1)-1/(a+1)]÷a[1-1/(1-a²)]=[2+1/(a-1)-1/(a+1)]÷a÷[(1-a&#

原式=(a-b)/(a+2b)×(a+2b)²/(a+b)(a-b)-1=(a+2b)/(a+b)-1=(a+2b-a-b)/(a+b)=b/(a+b)

1/(a+1)+(a²-a)/(a²-2a-3)÷a/(a-3)=1/(a+1)+(a-1)/(a+1)=a/(a+1)再问：谢谢，我主要是问(a²-2a-3)怎样分解因

(1+a的平方-4分之4)除以a-2分之a=[(a²-4+4）/（a²-4)]÷a/(a-2)=[a²/(a+2)(a-2)]×(a-2)/a=a/(a+2)=(a+2)

[1+3/(a-2)]除以(a+1)/(a^2-4)=(a+1)/(a+2)除以（a+1）/(a+2)(a-2)=(a+1)/(a+2)乘以(a+2)(a-2)/(a+1)=a-2

原式=[(a+1)/(a+1)(a-1)-(a-1)/(a+1)(a-1)-(a²-1)/(a+1)(a-1)]×(a+1)(a-1)=(a+1-a+1-a²+1)/(a+1)(a

1减a分之a-1除以a的平方+2a分之a的平方-1=1-(a-1)/a÷(a²-1)/(a²+2a)=1-(a-1)/a×[a(a+2)/(a-1)(a+1)]=1-(a+2)/(