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√21÷√17−5√15÷√5+2×3√3−4√30÷√10

Răspuns :

√21÷√17−5√15÷√5+2×3√3−4√30÷√10 =
=√21÷√17−5√3+6√3−4√3 =
=√(21/17)−3√3 =1,111-5,196=4,085

daca in loc de 17  ar fi fost 7 :

√21÷√7−5√15÷√5+2×3√3−4√30÷√10 =
=√3−5√3+6√3−4√3 =
=-2√3