[tex]8.- \\\\AC+BE=20\\\\(AB+BC)+BE=20\\\\BC+(AB+BE)=20\\\\BC+AE=20\\\\BC+BC+12=20\\\\2\cdot BC=8\\\\BC=4[/tex]
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[tex]8.- \\\\AC+BE=20\\\\(AB+BC)+BE=20\\\\BC+(AB+BE)=20\\\\BC+AE=20\\\\BC+BC+12=20\\\\2\cdot BC=8\\\\BC=4[/tex]