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Nevíte, jak se používají předpony iso a neo u rozvětvených alkanů (příklad) Děkuji
Na filmové představení bylo prodáno 120 lístků v ceně 3100 kč. Dětský lístek stojí 20 kč, dospělý 40 kč. Kolik dětských lístků bylo prodáno? řešení: a+b=120 20a+40b=3100 Ještě jsme se neučili…
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