1 Uprość
2xy-(x+4y) (x-3y)
2 Oblicz
│1-√3-√5│-│√5-2 │+2│√3-2│
zad. 1
2xy- (x+4y) ( x-3y) = 2xy- 2x-3xy + 4xy - 12y^2 = -xy + 2x - 12y^2
2xy-(x+4y) (x-3y)=2xy- (x^2 - 3xy +4xy - 12y^2) = 2xy - x^2 + 3xy - 4xy - 12y^2 =
= -x^2 - 12y^2 + xy
│1-√3-√5│-│√5-2 │+2│√3-2│= -1+√3+√5 - (√5-2) +2(√3-2)=-1+√3+√5-√5+2+2√3-4=3√3-3
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zad. 1
2xy- (x+4y) ( x-3y) = 2xy- 2x-3xy + 4xy - 12y^2 = -xy + 2x - 12y^2
2xy-(x+4y) (x-3y)=2xy- (x^2 - 3xy +4xy - 12y^2) = 2xy - x^2 + 3xy - 4xy - 12y^2 =
= -x^2 - 12y^2 + xy
│1-√3-√5│-│√5-2 │+2│√3-2│= -1+√3+√5 - (√5-2) +2(√3-2)=-1+√3+√5-√5+2+2√3-4=3√3-3