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calculati
√21-√3 pe 7-√7 *√7


Răspuns :

(√21-√3)/(7-√7)= rationalizam=
[(√21-√3)(7+√7)]/[(7-√7)(7+√7)]=
[7√21+√21√7-7√3-√3√7]/(49-7)=
(7√21+7√3-7√3-√21)/42=6√21/42=√21/7