Question

решите............................ ​

Answer 1

Ответ:

1)

$15 \frac{4}{9} - 4 \frac{4}{9} \times 3 \frac{3}{8} = \\ \frac{139}{9} - \frac{40}{9} \times \frac{27}{8} = \\ \frac{139}{9} - \frac{40 \times 27}{9 \times 8} = \\ \frac{139}{9} - \frac{5 \times 3}{1} = \\ \frac{139}{9} - 15 = \frac{139}{9} - \frac{135}{9} = \frac{4}{9}$

2)

$\frac{81}{88} \times (6 - \frac{28}{15} \times \frac{40}{21} ) = \\ \frac{81}{88} \times (6 - \frac{4 \times8 }{3 \times3 } ) = \\ \frac{81}{88} \times (6 - \frac{32}{9} ) = \\ \frac{81}{88} \times ( \frac{54}{9} - \frac{32}{9} ) = \frac{81}{88} \times \frac{22}{9} = \\ \frac{9}{4} = 2.25$

3)4,125

4)3 99/112