Question

найдите значение выражения 21,7:6,2-(1 3/4 - 2 2/3)

Answer 1

$21.7 \div 6.2 - (1 \frac{3}{4} - 2 \frac{2}{3} )$

решаем по действиям :

$1) 1 \frac{3}{4} - 2 \frac{2}{3} = \frac{7}{4} - \frac{8}{3} = \frac{21}{12} - \frac{32}{12} = - \frac{11}{12} .$

$2)21.7 \div 6.2 = \frac{21.7}{6.2} = \frac{217}{62} = \frac{7}{2} = 3 \frac{1}{2} .$

$3)3 \frac{1}{2} - ( - \frac{11}{12}) = 3 \frac{1}{2} + \frac{11}{12} = 3 + \frac{6}{12} +$

$+ \frac{11}{12} = 3 + \frac{17}{12} = 4 \frac{5} {12}.$

Ответ :

$4 \frac{5}{12} .$