化简√(a+2√a-1)+√(a-2√a-1) (a≥1)谢谢了,

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化简√(a+2√a-1)+√(a-2√a-1) (a≥1)谢谢了,
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化简√(a+2√a-1)+√(a-2√a-1) (a≥1)谢谢了,
化简√(a+2√a-1)+√(a-2√a-1) (a≥1)谢谢了,

化简√(a+2√a-1)+√(a-2√a-1) (a≥1)谢谢了,
√[a+2√(a-1)]+√[a-2√(a-1)] =√[(a-1)+1+2√(a-1)]+√[(a-1)+1-2√(a-1)] =√[√(a-1) +1]^2+√[√(a-1) -1]^2 =√(a-1) +1+ √(a-1) -1=2√(a-1) or =√(a-1) +1 +1-√(a-1)=2