|1-根号2|+|根号2-根号3l+|根号2-1|

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|1-根号2|+|根号2-根号3l+|根号2-1|

|1-根号2|+|根号2-根号3l+|根号2-1|
|1-根号2|+|根号2-根号3l+|根号2-1|

|1-根号2|+|根号2-根号3l+|根号2-1|
= -(1-根号2)-(根号2-根号3)+根号2-1
= -1+根号2-根号2+根号3+根号2-1
= 根号3+根号2-2

=根号2+根号3-2

根号2+根号3-2