|marjames| hồng trần trên đôi cánh tay
1. ( a + b )2 = a2 + 2ab + b22. ( a - b )2 = a2 - 2ab + b2 3. a2 - b2 = ( a - b )( a + b )4. ( a + b )3 = a3 + 3a2b + 3ab2 + b35. ( a - b )3 = a3 - 3a2b + 3ab2 - b36. a3 + b3 = ( a + b )( a2 - ab + b2 )7. a3 - b3 = ( a - b )( a2 + ab + b2 )…

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