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1. (2v3 - v2) (2+ v6) = 4v3 +2v(6.3) - 2v2 -v(6.2)
=4v3 +2v18 -2v2 -v12
=4v3 +2.3v2 -2v2 -2v3
=4v3 -2v3 +6v2 -2v2
=2v3 +4v2
2. (2v3 -v6) (v3 +v6) = 2v(3.3) +2.v(3.6) -v(6.3) -v(6.6)
=2.3 +2v18 -v18 -6
=6 -6 +2.3v2 -3v2
=6v2 -3v2
=3v2
= 4√3 + 6√2 - 2√2 - 2√3
= 2√3 + 4√2
(2√3-√6)(√3+√6) = 2√9 + 2√18 - √18 - √36
= 6 + 3√2 - 6
= 3√2
x = 32 dan y = 125