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-2rad7+5rad2/15rad14

Răspuns :

(-2√7+5√2)/15√14=
(-2√7+5√2)·√14/15·14=
(-2√7·14+5·√2·14)/210=
(-2·7√2+5·2√7)/210=
2·(-7√2+5√7)/210=
-7√2+5√7/105