Mathematics · Algebraic Identities
Solve: (6.9)3 + (2.8)3 + (6.3)3 - 3 × 6.9 × 2.8 × 6.3(6.9)2 + (2.8)2 + (6.3)2 - 6.9 × 2.8 - 2.8 × 6.3 - 6.9 × 6.3
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