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Calculati:
a) 15√80÷(3√5)+6√288÷(-2√2)-21√338÷(-7√2)


Răspuns :

15√80:(3√5)+6√288:(-2√2)-21√338:(-7√2) =
=
60√5:(3√5)+72√2:(-2√2)-273√2:(-7√2) =
=20-36+39 =23