Question

Пожалуйста помогите мне математика 6 класс

Answer 1

$\frac{7}{15} \div ( \frac{6}{10} - \frac{8}{3} ) + 19 \times \frac{2}{31} = \frac{7}{15} \div \frac{18 - 80}{30} + \frac{38}{31} = \frac{7}{15} \div ( - \frac{62}{30} ) + \frac{38}{31} = \frac{7}{15} \times ( - \frac{30}{62} ) + \frac{38}{31} = - \frac{14}{62} + \frac{38}{31} = \frac{ - 14 + 76}{62} = \frac{62}{62} = 1$

$(1 \frac{1}{35} \div \frac{4}{5} - 1 \frac{8}{35} ) \times 3 \frac{1}{3} = ( \frac{36}{35} \times \frac{5}{4} - \frac{43}{35} ) \times \frac{10}{3} = (\frac{9}{7} - \frac{43}{35} ) \times \frac{10}{3} = \frac{45 - 43}{35} \times \frac{10}{3} = \frac{2}{35} \times \frac{10}{3} = \frac{4}{21}$

$2 \frac{7}{9} \times \frac{18}{25} + \frac{9}{60} \div ( \frac{7}{12} - \frac{3}{5} ) = \frac{25}{9} \times \frac{18}{25} + \frac{9}{60} \div \frac{35 - 36}{60} = 2 + \frac{9}{60} \div ( - \frac{1}{60} ) = 2 + \frac{9}{60} \times ( - 60) = 2 - 9 = - 7$

$( \frac{4}{5} + \frac{4}{7} )(3 \frac{3}{8} + 2 \frac{11}{4} ) = \frac{28 + 20}{35} \times ( \frac{27}{8} + \frac{19}{4} ) = \frac{48}{35} \times \frac{27 + 38}{8} = \frac{48}{35} \times \frac{65}{8} = \frac{78}{7} = 11 \frac{1}{7}$