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Valoarea nr a=3supra radical 12 + 2supra radical 75 - 21supra 5 radical 27 +2supra radical 48?



Răspuns :

Răspuns:

Explicație pas cu pas:

a=3/√12+2/√75-21/5√27+2/√48=3/2√3+2/5√3-21/5·3√3+2/4√3=

=1/√3(3/2+2/5-21/15+1/2)=1/√3(2+2/5-21/15)=1/√3(30+6-21)/15=

=15/15√3=1/√3=√3/3