ważne, daje naj, najlepiej jakby było na dzis

[tex]a)\ \ (x+2y+3)(x-2)=x^2-2x+2xy-4y+3x-6=x^2+x+2xy-4y-6\\\\\\b)\ \ (2x-y+1)(2x-3)=4x^2-6x-2xy+3y+2x-3=4x^2-4x-2xy+3y-3\\\\\\c)\ \ (x^2+y)(x+y+2)=x^3+x^2y+2x^2+xy+y^2+2y=\\\\=x^3+x^2y+2x^2+xy+y^2+2y\\\\\\d)\ \ (x-y)(x^2-2x+1)=x^3-2x^2+x-x^2y+2xy-y\\\\\\e)\ \ 2x(x-2y)(3+y)=(2x^2-4xy)(3+y)=6x^2+2x^2y-12xy-4xy^2\\\\\\f)\ \ -4x(2x-y)(2x+y)=(-8x^2+4xy)(2x+y)=-16x^3-8x^2y+8x^2y+4xy^2=\\\\=-16x^3+4xy^2[/tex]

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Olaresviz Olaresviz · Answer 2

Olaresviz Olaresviz

[tex]a)\\\\(x+2y+3)(x-2)=x^2+2xy+3x-2x-4y-6=x^2+2xy+x-4y\\\\b)\\\\(2x-y+1)(2x-3)= 4x^2-2xy+2x-6x+3y+3=4x^2-2xy -4x+3y+3 \\\\c)\\\\ (x^2+y)(x+y+2)=x^3+x^2y+2x^2+xy+ y^2+2y\\\\d)\\\\(x-y)(x^2-2x+1)= x^3-2x^2+x-x^2y-2xy-y[/tex]

[tex]e)\\\\2x(x-2y)(3+y)=2x(3x+xy-6y-2y^2)= 6x^2+2x^2y-12xy-4xy^2\\\\f)\\\\-4x(2x-y)(2x+y)=-4x(4x^2+2xy-2xy-y^2)= -4x(4x^2 -y^2)=\\\\=-16x^3+ 4xy^2[/tex]

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