POEMA
Thirty days hath September,
April, June, and November;
February has twenty-eight alone,
All the rest have thirty-one,
Excepting leap-year, that's the time
When February's days are twenty-nine.
POLEAS
![POLEAS](http://4.bp.blogspot.com/_xkpTZ-pvUS4/Stg0zuPnokI/AAAAAAAAAAc/c0cr1Tx0alA/S220/sistema+de+poleas.gif)
SISTEMAS DE POLEAS
PALANCAS
Actividades tema 8
Lista de clase
miércoles, 7 de octubre de 2009
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