Question

даю 90 баллов.Поможете?​

Answer 1

16. Е

$24 - ((8 \frac{2}{3} - 5 \frac{1}{5} ) \times 6 \frac{3}{7} ) + 4 \frac{1}{6} \div 1 \frac{2}{3} = 24 - (( \frac{26}{3} - \frac{26}{5} ) \times \frac{45}{7} ) + \frac{25}{6} \div \frac{5}{3} = \\ \\ = 24 - (( \frac{130}{15} - \frac{78}{15} ) \times \frac{45}{7} ) + \frac{25}{6} \times \frac{3}{5} = 24 - ( \frac{52}{15} \times \frac{45}{7} ) + \frac{5}{2} = 24 - \frac{156}{7} + \frac{5}{2} = \frac{336}{14} - \frac{312}{14} + \frac{35}{14} = \\ \\ = \frac{59}{14} = 4 \frac{3}{14}$

17. D

$\frac{7(x - 6)}{4} = \frac{5(x + 1)}{3} - 3(x + 2) \\ \\ \frac{7x - 42}{4} = \frac{5x + 5}{3} - 3x - 6 \\ \\ \frac{7x - 42}{4} = \frac{5x + 5}{3} - \frac{9x}{3} - \frac{18}{3} \\ \\ \frac{7x - 42}{4} = \frac{ - 4x - 13}{3} \\ \\ 3(7x - 42) = 4( - 4x - 13) \\ \\ 21x - 126 = - 16x - 52 \\ \\ 21x + 16x = 126 - 52 \\ \\ 37x = 74 \\ \\ x = 2$