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Zmestia sa do obdĺžnika s veľkosťami strán a = 110 cm a b = 90 cm tri štvorce so stranou a = 0,3 m a 2 obdĺžniky s dĺžkou 20 cm a 10 cm? Ak áno, koľko plochy obdĺžnika zostane nepokrytého?
Aký je výsledný odpor rezistoru keď V elektrickom obvode sú za sebou (sériovo) zapojené dva rezistory s odpormi 20 a 80 ohmov ku zdroju s napätím 12 V.
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