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Ako vypocitam pH roztoku, ktorý obsahuje 5ml 3M roztoku H2SO4 a zároveň obsahuje aj 5ml 1 roztoku NaOH? Ďakujem.
Do skladu stavebného materialu priviezli ráno niekoľko ton piesku. Prvý zákazník Adamík z neho odviezol päť šestin. Druhý zákazník Biely kúpil dve tretiny zo zvyšku a posledný zákazník Certis si…
Do skladu stavebného materialu priviezli ráno niekoľko ton piesku. Prvý zákazník Adamík z neho odviezol päť šestin. Druhý zákazník Biely kúpil dve tretiny zo zvyšku a posledný zákazník Certis si…
Sedem dvanastin okien na zámku je v tvare n-uholnika. Z tychto okien je šesť štrnastin v tvare stvoruholnika, pričom 2 pätiny z nich tvoria okná stvorcove. Kolko okien je na zámku ak stvorcovych…
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