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Mathematics, 02.09.2021 14:10 megandalolipop

. If a, b, c are in H. P., prove that
(bc)/(b + c), (ca)/(c + a), (ab)/(a + b) are in H. P.​

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. If a, b, c are in H. P., prove that
(bc)/(b + c), (ca)/(c + a), (ab)/(a + b) are in H. P.​...
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