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Story by e-i-k-ay
- 1 Published Story
|marjames| hồng trần trên đôi cánh...
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1. ( a + b )2 = a2 + 2ab + b2
2. ( a - b )2 = a2 - 2ab + b2
3. a2 - b2 = ( a - b )( a + b )
4. ( a + b )3 =...