CMR: $\left | z_{1}z_{2}+z_{2}z_{3}+z_{3}z_{1} \right |=\left | z_{1}+z_{2}+z_{3} \right |$
Edited by Mr0, 23-06-2012 - 11:30.
Cho số phức z1,z2,z3 : $\left | z_{1} \right |=\left | z_{2} \right |=\left | z_{3} \right |=1$. CMR
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Started By Mr0, 23-06-2012 - 11:28
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Posted 23-06-2012 - 11:28
Mr0
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Cho số phức z1,z2,z3 : $\left | z_{1} \right |=\left | z_{2} \right |=\left | z_{3} \right |=1$
CMR: $\left | z_{1}z_{2}+z_{2}z_{3}+z_{3}z_{1} \right |=\left | z_{1}+z_{2}+z_{3} \right |$
CMR: $\left | z_{1}z_{2}+z_{2}z_{3}+z_{3}z_{1} \right |=\left | z_{1}+z_{2}+z_{3} \right |$
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