 kalvifa 
                                                22.12.2020 05:24
                                                
                                                kalvifa 
                                                22.12.2020 05:24
                                             Вундеркингsd 
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                                                Вундеркингsd 
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                                             Nialya2727 
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                                                Nialya2727 
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                                                ayazhankadyrov24 
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                                             KitKat321456 
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                                                KitKat321456 
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                                             elenaandreeva34 
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                                                elenaandreeva34 
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                                             Almazik20056 
                                                13.07.2019 09:30
                                                
                                                Almazik20056 
                                                13.07.2019 09:30
                                            
2. 2a^2-12ab-ab+4b^2=2a^2+4b^2-13ab
3. 15a^2b+18a^3+20ab+24a^2