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| 1. |
If (a + b + c) {(a – b)2 + (b – c)2 + (c – a)2} = k(a3 + b3 + c3 – 3abc), then k = ________. |
| Answer» If (a + b + c) {(a – b)2 + (b – c)2 + (c – a)2} = k(a3 + b3 + c3 – 3abc), then k = ________. | |