Question

$if \: l + m + n = 9 \: \: \: \: \: {l}^{2} + {m}^{2} + {n}^{2} = 27 \: \: \: \: \: {l}^{3} + {m}^{3} + {n}^{3} = 81 \: then \: find \: lmn.$
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Answer 1

Answer:

can you explain me easily it's looking difficult