Question

2-3 1/7*(2-1 9/11)разделить на 8/21

Answer 1

$2-3 frac{1}{7} *(2-1 frac{9}{11} )/ frac{8}{21}$
$1) 2-1 frac{9}{11} = frac{2}{1} - frac{20}{11} = frac{22-20}{11} = frac{2}{11}$
$2) frac{1}{7} * frac{2}{11} = frac{1*2}{7*11} = frac{2}{77}$
$3) frac{2}{77} / frac{8}{21} = frac{2*21}{77*8} = frac{1*21}{77*4} = frac{21}{308}$
$4) 2- frac{21}{308} = frac{2}{1} - frac{21}{308} = frac{616-21}{308} = frac{595}{308} = 1 frac{287}{308} = 1 frac{31}{44}$