Question

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Answer 1

72,5 …..,.,..,.,.,,.,.,.,.,.,.,.,.,.

Answer 2

Упростить выражение:

$- 2.4( - 5 \frac{1}{4} x + 1 \frac{5}{6} y) - \frac{9}{14} (4.2x - 1 \frac{5}{9} y) = - \frac{24}{10} ( - \frac{21}{4} x + \frac{11}{6} y) - \frac{9}{14} ( \frac{42}{10} x - \frac{14}{9} y) = - \frac{12}{5} ( - \frac{21}{4} x + \frac{11}{6} y) - \frac{9}{14} ( \frac{21}{5} x - \frac{14}{9} y) = - \frac{12}{5} \times ( - \frac{21}{4} ) \times x + ( - \frac{12}{5} ) \times \frac{11}{6} \times y + ( - \frac{9}{14} ) \times \frac{21}{5} \times x + ( - \frac{9}{14} ) \times ( - \frac{14}{9} ) \times y = \frac{12 \times 21}{5 \times 4} x - \frac{12 \times 11}{5 \times 6} y - \frac{9 \times 21}{14 \times 5} x + \frac{9 \times 14}{14 \times 9} y = \frac{6 \times 21}{5 \times 2} x - \frac{4 \times 11}{5 \times 2} y - \frac{9 \times 3}{2 \times 5} x + y = \frac{126}{10} x - \frac{44}{10} y - \frac{27}{10} x + y =$

$( \frac{126}{10} - \frac{27}{10} )x + ( - \frac{44}{10} + 1)y = \frac{99}{10} x + ( - \frac{44}{10} + \frac{10}{10} )y = \frac{99}{10} x - \frac{34}{10} y$

Найти значение выражения, если $x = - \frac{1}{11}$, $y = - 4.5$:

$\frac{99}{10} \times ( - \frac{1}{11} ) - \frac{34}{10} \times ( - 4.5) = - \frac{99}{10 \times 11} - \frac{34}{10} \times ( - \frac{45}{10}) = - \frac{9}{10} + \frac{34 \times 45}{10 \times 10} = - \frac{9}{10} + \frac{17 \times 9}{5 \times 2} = - \frac{9}{10} + \frac{153}{10} = \frac{144}{10} = 14.4$

Ответ: $14.4$