Question

Найдите значение выражения:
А)$\frac{29}{7} :(\frac{2}{7} +\frac{3}{4} )$
Б)$\frac{9,5+8,9}{2,3}$
В)$(4\frac{3}{8} -\frac{11}{5} ) : \frac{3}{40}$

Answer 1

$a)\;\frac{29}7:\left(\frac27+\frac34\right)=\frac{29}7:\left(\frac8{28}+\frac{21}{28}\right)=\frac{29}7:\frac{29}{28}=\frac{29}7\cdot\frac{28}{29}=4\\\\b)\;\frac{9,5+8,9}{2,3}=\frac{18,4}{2,3}=8\\\\c)\;\left(4\frac38-\frac{11}5\right):\frac3{40}=\left(\frac{35}8-\frac{11}5\right)\cdot\frac{40}3=\left(\frac{175}{40}-\frac{88}{40}\right)\cdot\frac{40}3=\frac{87}{40}\cdot\frac{40}3=29$