Яка з даних рівностей є тотожністю: 1) m³ +8n® =(m+ 2n²) (m² + 2mn2+4n1); 2) m³ +8n® =(m-2n²) (m² + 2mn2+4n'); 3) m³+8n6=(m+2n²) (m² - 2mn2+4n'); 4) m³ +8n® =(m-2n²) (m² - 2mn²+4n1)?
помогите нужно срочно​
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