Question

1. Add: a² + b² + c² – 3abc and a² – b² + c² + abc

Answer 1

Answer:

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Answer 2

${a}^{2} + {b}^{2} + {c}^{2} - 3abc + {a}^{2} - {b}^{2} + {c}^{2} + abc \\ = 2 {a}^{2} + 2 {c}^{2} - 2abc$

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