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Ca = 40u
2*O = 2*16u=32u
2*H = 2*1u=2u
Suma 74u
Ca:O:H
40:32:2 (skracamy przez 2)
i otrzymujemy 20:16:1
Ca : O : H
40 : 32 : 2
po skróceniu
20: 16: 1