Question

Как можно скорее очень срочно!!!!!

Answer 1

$1)( - \frac{5}{12} + \frac{11}{16} ) \div ( - \frac{13}{12}) = ( \frac{ - 5 \times 4 + 11 \times 3}{48} ) \times ( - \frac{12}{13} ) = \frac{ - 20 + 33}{48} \times ( - \frac{12}{13} ) = \frac{13}{48} \times ( - \frac{12}{13}) = \frac{ - 13 \times 12}{48 \times 13} = \frac{ - 1 \times 1}{4 \times 1} = - \frac{ 1}{4} = 0.25$

$2)( \frac{9}{14} - ( - \frac{5}{21} )) \div ( - 2 \times \frac{9}{14} ) = ( \frac{9}{14} + \frac{5}{21} ) \div ( - \frac{37}{14} ) = \frac{9 \times 3 + 5 \times 2}{42} \times ( - \frac{14}{37} ) = \frac{27 + 10}{42} \times ( - \frac{14}{37} ) = \frac{37}{42} \times ( - \frac{14}{37} ) = \frac{ - 37 \times 14}{42 \times 37} = \frac{ - 1 \times 1}{3 \times 1} = - \frac{1}{3}$

$( \frac{7}{16} - \frac{31}{40} ) \div ( \frac{17}{24} + \frac{27}{40} ) = (\frac{7 \times 5 - 31 \times 2}{80} ) \div ( \frac{17 \times 5 + 27 \times 3}{120} ) = \frac{35 - 62}{80} \div \frac{85 + 81}{120} = \frac{ - 27}{80} \div \frac{166}{120} = - \frac{27}{80} \times \frac{120}{166} = \frac{ - 27 \times 3}{2 \times 166} = \frac{ - 81}{332}$