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3*raiz3(3a) *( 9* raiz3(7a^2)=
27*raiz3(21a^3)=
27a*raiz3(21)
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V es raiz de 2
4V(7^2*b^-4) + V(3^4*b^-4)+V(2^4*3^2*b^-4)=
28V(b^-4) +9V(b^-4)+12V(b^-4)=
49V(b^-4)= 49*(1/Vb^4)= 49/b^2
espero que lo entiendas