计算:1-[a- 1/(1-a)]²÷[(a²-a+1)/(a²-2a+1)]
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计算:1-[a- 1/(1-a)]²÷[(a²-a+1)/(a²-2a+1)]
计算:1-[a- 1/(1-a)]²÷[(a²-a+1)/(a²-2a+1)]
计算:1-[a- 1/(1-a)]²÷[(a²-a+1)/(a²-2a+1)]
1-[a- 1/(1-a)]²÷[(a²-a+1)/(a²-2a+1)]
=1-[a(1-a)/(1-a)-1/(1-a)]²÷[(a²-a+1)/(a-1)²]
=1-(a²-a+1)²/(a-1)²×(a-1)²/(a²-a+1)
=1-(a²-a+1)
=-a²+a
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