Zadania a) (x+y+1)(2x-y)+(-1)(x-1)(2x+3y)= b)-(x+5)(2x+y-3)+(4x-2y)(x-y+3)= c)(3x+y)(x-5y)-x(x+4y-1)-2x(x-9y)= d) (x-y)(2x+3y)(x+2y)(-x+5y)=
źródło:
a) (x+y+1)(2x-y)+(-1)(x-1)(2x+3y) = -2xy-y^2+4x+2y
b) -(x+5)(2x+y-3)+(4x-2y)(x-y+3) = 2x^2-7xy+5x-11y+2y^2+15
c) (3x+y)(x-5y)-x(x+4y-1)-2x(x-9y) = -y^2*5+x
d) (x-y)(2x+3y)(x+2y)(-x+5y) = -x^(4)2+5x^(3)y+26x^2y^2+xy^(3)-y^(4)*30
a) (x+y+1)(2x-y)+(-1)(x-1)(2x+3y) = -2xy-y^2+4x+2y b) -(x+5)(2x+y-3)+(4x-2y)(x-y+3) = 2x^2-7xy+5x-11y+2y^2+15 c) (3x+y)(x-5y)-x(x+4y-1)-2x(x-9y) = -y^25+x
podpunktu D niestety nie jestem pewna, więc wole nie pisać.