Question

Решите очень срочно задание 1,2

Answer 1

#1

1)

$2 \frac{1}{6} + 2 \frac{2}{12} \times (1.25 - 1.64 \div 0.8) = \\ = \frac{13}{6} + \frac{26}{12} \times (1.25 - 2.05) = \\ = \frac{13}{6} + \frac{26}{12} \times ( - 0.8) = \\ \frac{13}{6} + \frac{26}{12} \times ( - \frac{4}{5} ) = \\ = \frac{13}{6} - \frac{26}{3} \times \frac{1}{5} = \\ = \frac{13}{6} - \frac{26}{15} = \frac{13}{30}$

2)

$\frac{(4 \frac{2}{3} \div 2 - 1.8) \times 0.75 - 0.3}{2.32 \div 14.5} = \frac{( \frac{14}{3} \times \frac{1}{2} - \frac{9}{5}) \times \frac{3}{4} - \frac{3}{10} }{0.16} = \\ = \frac{( \frac{7}{3} - \frac{9}{5}) \times \frac{3}{4} - \frac{3}{10} }{ \frac{4}{25} } = \frac{ \frac{8}{15} \times \frac{3}{4} - \frac{3}{10}}{ \frac{4}{25} } = \\ = \frac{ \frac{2}{5} - \frac{3}{10} }{ \frac{4}{25} } = \frac{ \frac{1}{10} }{ \frac{4}{25} } = \frac{5}{8} = 0.625$

#2

1)

$\frac{x + 3}{3} = - 2 - \frac{1 - 3x}{4} \\ 4x + 12 = - 24 - 3 + 9x \\ 4x + 12 = - 27 + 9x \\ 4x - 9x = - 27 - 12 \\ - 5x = - 39 \\ x = \frac{39}{5} = 7.8$