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Ответ:
(«Телесистемы»: Конференция «Аналоговая схемотехника»)
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U1=up1-um2; U2=up2-um2; U3=up3-um3; US=usp-usm=U1+U2+U3=(up1+up2+up3)-(um1+um2+um3); usp=up1+up2+up3; usm=um1+um2+um3; Надо просто сложить по отдельности.