Представьте в виде многочлена:
1)(2xy-1)(2xy+1)
2)(8ab+5)(5-8ab)
3)(8+9cd)(9cd-8)
Выполните действия:
1)(a²+b²)(a²-b²)
2)(10m²-n²)(10m²+n²)
3)(5-x)(5+x)(25+x²)
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