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Calculati, folosind proprietatea √a*√b=√ab, unde a>_0, b>_0:
a) √5*√3
b) √7*(-2)*(-√3)
c) √8/15*√1,1/2


Răspuns :

√5×√3=√5×3=√15
√7×(-2)×(-√3)= (-2√7)×(-√3)=2√7×√3=2√21