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3pe 28 + 1 pw 72 + 5 pe 84 ..Dau coroană

Răspuns :

[tex] \frac{3}28} [/tex]+[tex] \frac{1}{72} [/tex]+[tex] \frac{5}{84} [/tex]=
=[tex] \frac{9}{84} [/tex]+[tex] \frac{1}{72} [/tex]+[tex] \frac{5}{84} [/tex]
=[tex] \frac{14}{84} [/tex]+[tex] \frac{1}{72} [/tex]
=[tex] \frac{1}{6} [/tex]+[tex] \frac{1}{72} [/tex]
=[tex] \frac{12}{72} [/tex]+[tex] \frac{1}{72}[/tex]
=[tex] \frac{13}{72} [/tex]