Question

найдите значение выражения 4,2*(2 3/4-5/6)

Answer 1

$4,2*(2 \frac{3}{4} - \frac{5}{6} )=4,2*(2 \frac{9}{12} - \frac{10}{12} )=4,2*(1 \frac{21}{12} - \frac{10}{12} )=4,2*1 \frac{11}{12} = \\ \frac{42}{10} * \frac{23}{12} = \frac{7*23}{10*2} =8,05$