(a-1)[1-(a+1)÷(a-1/a)]

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(a-1)[1-(a+1)÷(a-1/a)]
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(a-1)[1-(a+1)÷(a-1/a)]
(a-1)[1-(a+1)÷(a-1/a)]

(a-1)[1-(a+1)÷(a-1/a)]
(a-1)[1-(a+1)÷(a-1/a)]
= (a-1)[1-(a+1)×a/(a^-1)]
=a-1-a(分配律)
=-1.

原式=(a-1)【1-(a+1)x(a/a-1)】
=a-1-a(a+1)
=a-1-a2-a
-(a2+1)

=(a-1)-(a+1)(a/a-1)(a-1)
=a-1-a的二次方-a
= -a的二次方-1

     (a-1)[1-(a+1)÷(a-1/a)] 

  = (a-1)[1-(a+1)÷(a^2-1/a)] 

  •       倒除为乘

  =(a-1)[1-(a+1)*a/(a+1)(a-1)] 

  •   化简,约分

  =(a-1)(1-a/a-1)

  =(a-1)(a-1-a/a-1)

  =-(a-1) 1/a-1

       =-1

表示一个一个符号复制粘贴好痛苦= =、