Question

Найдите значение выражения (5/6+2 2/5)*7,5

Answer 1

$\bigg(\dfrac 56+2\dfrac 25\bigg)\cdot 7,5=\bigg(\dfrac 56^{(5}+2\dfrac 25^{(6}\bigg)\cdot 7,5=\\\\\\=\bigg(\dfrac {25}{30}+2\dfrac {12}{30}\bigg)\cdot 7,5=2\dfrac {37}{30}\cdot \dfrac{75}{10}=\\\\\\=\dfrac {97}{30}\cdot \dfrac{15}2=\dfrac{97}4=24\dfrac 14=24,25$