Question

По всем номерам. сорь за качество, фоткала не я (фотография)

Answer 1

$1)19 - 6 \times 3 = 19 - 1 = 1 \\ 2) \frac{8}{9} - \frac{8}{15 } \times \frac{5}{6} = \frac{8}{9} - \frac{4}{9} = \frac{4}{9} \\ 3)5x - (x + 2) = \\ 5 \times ( - 6) - ( - 6 + 2) = \\ - 30 - ( - 4) = - 30 + 4 = - 26 \\ 4)(5.4 - 8.1) \div 0.6 = \\ - 2.7 \div 0.6 = - 4.5 \\ 5)1 \frac{13}{14} - (2 - 1 \frac{11}{35} ) \div \frac{9}{25} + \frac{4}{21} = \\ 1 \frac{13}{14} - \frac{24}{35} \times \frac{25}{9} + \frac{4}{21} = \\ 1 \frac{13}{14 } - \frac{24}{21} + \frac{4}{21} = \\ 1 \frac{39}{42} - 1 \frac{6}{42} + \frac{8}{42} = \\ \frac{41}{42}$