Odpowiedź:
[tex]d)\ \ 2(x+y)-(1-2x)(1+2y)=2x+2y-(1+2y-2x-4xy)=\\\\=2x+2y-1-2y+2x+4xy=4x+4xy-1\\\\\\e)\ \ (4a-1)(2b+2)+2b(1-2a)=8ab+8a-2b-2+2b-4ab=4ab+8a-2\\\\\\f)\ \ (2a+b)(a-1)-(b-1)(a+2)=2a^2-2a+ab-b-(ab+2b-a-2)=\\\\=2a^2-2a+ab-b-ab-2b+a+2=2a^2-a-3b+2[/tex]
