1 5/12+2 5/8 вычеслите

[latex]1frac{5}{12}+2frac{5}{8}=frac{1*12+5}{12}+frac{2*8+5}{8}=frac{17}{12}+frac{21}{8}=\=frac{17}{4*3}+frac{21}{4*4}=frac{4*17}{4*4*3}+frac{21*3}{4*4*3}=frac{4*17+21*3}{4*4*3}=frac{68+63}{48}=\=frac{131}{48}=2frac{35}{48}.[/latex]