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a)|√3-√5|+|√5-√7|-|√7-√3|
b)|√12-2|-|√3+√2|+2|√2-√3|
c)|√27-√81|+|2√3+√5|+|√5-√27|
d)|√3+5|+|2√5-√3|+|10-√20|


Răspuns :

|√3-√5|=√5-√3|√5-√7|=√7-√5|√7-√3|=√7-√3√5-√3+√7-√5-√7-√3/simplificam +√7 cu -√7 s.a.m.d./=0