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1. (2-х)(2+х) А) х2-4 2. (3+а)(3-а) Б) 9-х2 3. (х-у)(х+у) В) х2-у2 4. (у-х)(х+у) Г) у-х2 5. (х-2)(2+х) Д) 4-х2 6. (а+3)(а-3) Е) х2-9 ​
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