ສະເໝີຜົນຄວນຈື່
1. ( a + b ) = a2 + 2ab + b2
2. ( a - b ) = a2 - 2 ab + b2
3. a2 – b2 = ( a + b )( a – b )
4. ( a + b )3 = a3 + 3a2b + 3ab2 + b3
5. ( a – b )3 = a3 – 3a2b + ab2 – b3
6. a3 + b3 = (a + b )( a2 – ab + b2 )
7. a3 – b3 = ( a – b )( a2 + ab + b2)
8. ( a + b + c )2 = a2 + b2 + c2 + 2ab + 2ac + bc