Question

Выполните действие а) 3 1/3+1 2/5 б) 2 1/12-1 7/12 в) 24*14/15 г) 4/5: 20

Answer 1

$3 \frac{1}{3} + 1\frac{2}{5} = ( 3+1) +( \frac{1}{3} + \frac{2}{5} ) = 4+ \frac{5+6}{15}= 4\frac{11}{15}$
$2\frac{1}{12} - 1 \frac{7}{12} = \frac{25}{12} - \frac{19}{12} = \frac{25-19}{12} = \frac{6}{12} = \frac{1}{2} =0,5$
$24* \frac{14}{15} =8* \frac{14}{5} = \frac{112}{5} =22 \frac{2}{4} =22,4$
$\frac{4}{5} :20= \frac{4}{5} * \frac{1}{20} = \frac{1}{5} * \frac{1}{5} = \frac{1}{25} =0,04$