|1-根号2|+|根号2-根号3|-|根号3-根号2|

问题描述:

|1-根号2|+|根号2-根号3|-|根号3-根号2|

|1-√2|+|√2-√3|-|√3-√2|
= √2-1+√3-√2-√3+√2
= √2-1
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