Question

Вычислите: 0,75:(-3/20)-8,4:(-2/3);   7,6:(-1цел4/15)-(-9,75):1цел1/12

Answer 1

$- (frac{3 * 20}{4 *3}) + ( frac{42 *3}{5 * 2} ) = frac{63}{5} - 5 = 12,6 - 5 = 7,6$
$7,6 : (-1 frac{4}{15}) - (-9,75) :1 frac{1}{12} = - ( frac{38 * 15}{5 * 19} ) + ( frac{39 * 12}{4 * 13} ) = -6 + 9 = 3$