ДАМ 20 БАЛЛОВ!!!
Представьте выражение 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)=
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