若a=-1-√2,求√a²-2a+1的值 a²-2a+1都在根号下)
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若a=-1-√2,求√a²-2a+1的值 a²-2a+1都在根号下)
若a=-1-√2,求√a²-2a+1的值 a²-2a+1都在根号下)
若a=-1-√2,求√a²-2a+1的值 a²-2a+1都在根号下)
a=﹣1-√2
a-1=﹣2﹣√2
∴ √﹙a²-2a+1﹚=|a-1|=|﹣2-√2|=2+√2.