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%C=60u/72u * 100%=83,33%
60/72 to trzeba napisać pod kreska
%H=12u/72u * 100%=16,67%
b)m C₉H₁₈=12u * 9 + 18 * 1u=108u + 18u
%C=108u/126u * 100%=85,71%
%H=18u/126u * 100%=14,29%