Question

-8+4 3/7+ 2 11/21=???
2.2+(-4 1/3)+(-1 13/15)=???

Answer 1

$- 8 + 4 frac{3}{7} + 2 frac{11}{21} = - 8 + 4 frac{9}{21} +2 frac{11}{21} =$
$- 7 frac{21}{21} + 6 frac{20}{21} = - 1 frac{1}{21}$

$2.2 + ( - 4 frac{1}{3} ) + ( - 1 frac{13}{15} ) =$$2 frac{1}{5} -4 frac{5}{15} - 1 frac{13}{15} = 2 frac{3}{15} - 5 frac{18}{15} = frac{33}{15} - frac{93}{15} =$$- frac{60}{15} = - 4$