Ответ:

10 29/90

Пошаговое объяснение:

1) 10 7/15 - 1/9 = 10 21/45 - 5/45 = 10 16/45

2) 10 16/45 - 1/30 = 10 32/90 - 3/90 = 10 29/90

Пошаговое объяснение:

[tex]1)10 \frac{7}{15} - \frac{1}{9} = \frac{7 + 10 \times 15}{15} - \frac{1}{9} = \frac{157}{15} - \frac{1}{9} = \frac{157 \times 3}{15 \times 3} - \frac{1 \times 5}{9 \times 5} = \frac{471}{45} - \frac{5}{45} = \frac{471 - 5}{45} = \frac{466}{45} = \frac{10 \times 45 + 16}{45} = 10 \frac{16}{45} [/tex]

[tex]2)10 \frac{16}{45} - \frac{1}{30} = \frac{16 + 10 \times 45}{45} - \frac{1}{30} = \frac{466}{45} - \frac{1}{30} = \frac{466 \times 2}{45 \times 2} - \frac{1 \times 3}{30 \times 3} = \frac{932}{90} - \frac{3}{90} = \frac{932 - 3}{90} = \frac{929}{90} = \frac{10 \times 90 + 29}{90} = 10 \frac{29}{90} [/tex]