Oblicz.Prosze o obliczenia a nie same wyniki + daje naj i 80pkt a) (√3+2√2)(4√3-8√2) b)(2√5-4√2)(2√2+√5) c) (2√3-3√2(√2+√3)-( 4-√6) d) (√5+2√3)(2√5-√3)+( 6-3√15)

[latex]a) (sqrt3+2sqrt2)(4sqrt3-8sqrt2)=(sqrt3+2sqrt2)cdot4(sqrt3-2sqrt2)=\ =4(3-4cdot2)=4(3-8)=4cdot(-5)=-20\ \ b) (2sqrt5-4sqrt2)(2sqrt2+sqrt5)=-2(-sqrt5+2sqrt2)(2sqrt2+sqrt5)=\ =-2(2sqrt2-sqrt5)(2sqrt2+sqrt5)=-2(4cdot2-5)=\ =-2(8-5)=-2cdot3=-6\ \ c) (2sqrt3-3sqrt2)(sqrt2+sqrt3)-( 4-sqrt6)=\ =2sqrt6+2cdot3-3cdot2-3sqrt6-4+sqrt6=-4\ \ d) (sqrt5+2sqrt3)(2sqrt5-sqrt3)+( 6-3sqrt{15})=\ =2cdot5-sqrt{15}+4sqrt{15}-2cdot3+6-3sqrt{15}=10[/latex]