先化简,再求值:a-1分之根号下a的平方-2a+1+a+1分之1+1,其中a=根号2-1

2025-01-07 08:16:52
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回答1:

a-1分之根号下a的平方-2a+1+a+1分之1+1
=√(a-1)²/(a-1)+1/(a+1)+1
=-1+1/(a+1)+1
=1/(a+1)
=1/(√2)
=√2/2;