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...=V(20-12v10+18)=
=V((2v5)^2-2*2v5*3v2+(3v2)^2)=
=V(2v5 - 3v2)^2=
= 2v5 - 3v2
b)
...=V(108 + 48v15 + 80 )=
=V((6v3)^2 + 2*6v3*4v5+(4v5)^2)=
=V(6v3 + 4v5)^2=
=6v3 + 4v5