Odpowiedź :
[tex]b)~~2\frac29-3\frac56+5\frac13=2\frac4{18}-3\frac{15}{18}+5\frac6{18}=\frac9{18}+5\frac6{18}=5\frac{15}{18}=5\frac56\\\\c)~~2\frac29+1\frac5{12}-\frac78=2\frac8{36}+1\frac{15}{36}-\frac78=3\frac{23}{36}-\frac78=3\frac{46}{72}-\frac{63}{72}=2\frac{55}{72}[/tex]