Question

помогите решить 6 примеров -3/4•5/7=? -1/3•(-9/13)=? 3/4•(-16)=? -6:5/6=? -7/8:7=? -3 4/9:(-1 13/18)=?

Answer 1

$- frac{3}{4} times frac{5}{7} = - frac{15}{28}$

$- frac{1}{3} times ( - frac{9}{13} ) = frac{9}{39} = frac{3}{1 3}$

$frac{3}{4} times ( - 16) = 3 times ( - 4) = - 12$

$- 6 div frac{5}{6} = - 6 times frac{6}{5} = - frac{36}{5} = - 7.2$

$- frac{7}{8} div 7 = - frac{7}{8} times frac{1}{7} = - frac{1}{8} = - 0.125$

$- 3 frac{4}{9} div ( - 1 frac{13}{18} ) = - frac{31}{9} div ( - frac{31}{18} ) =$
$= - frac{31}{9} times( - frac{18}{31} ) = 2$