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https://bravikov.wordpress.com/2012/03/16/maxima-%d0%be%d0%bf%d0%b5%d1%80%d0%b0%d1%82%d0%be%d1%80%d0%bd%d1%8b%d0%b9-%d0%bc%d0%b5%d1%82%d0%be%d0%b4-%d1%80%d0%b0%d1%81%d1%87%d0%b5%d1%82%d0%b0-%d1%8d%d0%bb%d0%b5%d0%ba%d1%82%d1%80%d0%b8%d1%87/
maxima + операторный метод расчета электрических цепей