zad.1 Oblicz wartości liczbowe wyrażeń dla podanych wartości zmiennych.   a). x(3xy -y)- y(x²-xy +x)        dla x= -1 , y= ¹/₅   zad.2  Wyłącz wspólny czynnik przed nawias.  a). k²l - kl²  b). x² - 2x² + x  c). 3ab² - 2a²b- ab  d). ¹/₂ ac²- ¹/₄ a² + ¹/₂ a

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                Zad.1 a) x( 3xy- y ) - y (x^2- xy +x)= 3x^2y - xy - x^2y + xy^2 + xy= 2x^2 + xy^2= 2*(-1) * 1/25= 2- 1/25 = 1 24/25   Zad. 2 a) k^2 - kl^2 = kl (k-l) b) x^2- 2x^2 +x = x ( x-2x+1) c) 3ab^2 - 2a^2b- ab = ab (3b- 2a-1) d) 1/2 ac^2 - 1/4 a^2 + 1/2 a^2= 1/2a (c^2 - 1/2 a +1)                                                                                                               

zad1  x(3xy - y)-y(x ²-xy+x)= 3x²y-xy -x²y+ xy²-xy= 2x²y-x²y+x²y²= 2*(-1)²* ⅕-(-1)²*⅕-1*(⅕)²= 2*⅕-⅕-¹/₂₅=²/₅ -¹/₅ -¹/₂₅= ¹/₅ - ¹/₂₅ = ⁵/₂₅ - ¹/₂₅ = ⁴/₂₅