Question

[Minh Bui Tuan Minh]

a(1/b+1/c) + b(1/c+1/a) + c(1/b+1/a) = -2, a^3 + b^3 + c^3 = 1.CMR 1/a + 1/b + 1/c = 1

Answer 1

[ღ๖ۣۜCô ρɦươηɠ тự тɦưởηɠღ 《孤芳自赏...]

a(1/b+1/c) + b(1/c+1/a) + c(1/b+1/a) = -2, a^3 + b^3 + c^3 = 1

.CMR 1/a + 1/b + 1/c = 1

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