Представьте в виде многочлена
1) (2xy-1) (2xy+1);
2) (1+3ab) (1-3ab);
3) (8ab+5) (5-8ab);
4) (10cx-6) (10cx+6);
5) (8+9cd) (9cd-8);
6) (0,2t-0,5u) (0,2t+0,5u).
Помогите плиз!
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