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(4√3-6√3+2√3)(√5+2-5√3)=
0(√5+2-5√3)=0
= (√16*√3 -2*√9*√3 + √4*√3) ( √5 +2 - √25*√3)=
= ( 4√3 - 2*3*√3 + 2√3) ( √5 +2 - 5√3) =
= (6√3 - 6√3) ( √5 +2 - 5√3) =
= 0*( √5 +2 - 5√3) =
= 0
Wynik należy do znioru W ( liczb wymiernych )