Question

3/7 + (-9/14); 6) -5/9 + 1/12; B) -2/3 • (-5/8); 1)-3/28 : 517 +​

Answer 1

Ответ:

3/7+(-9/14)=-3/14

-5/9+1/12=-17/36

-2/3*(-5/8)=-1/24

-3/28 : 517= - 3/14476

Answer 2

Ответ:

$\frac{3}{7} + ( - \frac{9}{14} ) = \frac{3 \times 2}{7 \times 2} - \frac{9}{14} = \frac{6}{14} - \frac{9}{14} = - \frac{3}{14}$

$- \frac{5}{9} + \frac{1}{12} = - \frac{5 \times 4}{9 \times 4} + \frac{1 \times 3}{12 \times 3} = - \frac{20}{36} + \frac{3}{36} = - \frac{17}{36}$

$- \frac{2}{3} \times ( - \frac{5}{8} ) = + \frac{2 \times 5}{3 \times 8} = \frac{5}{12}$

$- \frac{3}{28} \div 517 = - \frac{3 \times 1}{28 \times 517} = - \frac{3}{14476}$