Question

5 4/19 умножить на 3 4/7 плюс 1 15/19 разделить 7/25 минус 1 2/3

Answer 1

$5 \frac{4}{19} *3 \frac{4}{7} +1 \frac{15}{19} : \frac{7}{25} -1 \frac{2}{3} =23 \frac{1}{3} \\ 1)~5 \frac{4}{19} *3 \frac{4}{7}= \frac{5*19+4}{19} * \frac{3*7+4}{7} = \frac{99}{19}* \frac{25}{7} = \frac{99*25}{19*7}= \frac{2475}{133} =18 \frac{81}{133} \\ 2)~~1 \frac{15}{19} : \frac{7}{25}= \frac{1*19+15}{19} * \frac{25}{7}=\frac{34}{19} * \frac{25}{7}=\frac{34*25}{19*7} = \frac{850}{133} =6 \frac{52}{133} \\ 3)~~ 18 \frac{81}{133}+6 \frac{52}{133}= 18+6+\frac{81+52}{133}= 24\frac{133}{133} =24 +1=25$
$4)~~25-1 \frac{2}{3} =24 \frac{3}{3} -1 \frac{2}{3}=23 \frac{1}{3}$