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ułamek wapnia:
1 ---- 310 g
x ---- 120 g
x = 0.387
ułamek fosforu:
1 ---- 310 g
y ---- 62 g
y = 0.2
ułamek tlenu:
z = 1 - (0.2 + 0.387) = 0.413
proszę :)