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Ответ:

[tex]2)6 - 3 \frac{2}{17} = 5 \frac{17}{17} - 3 \frac{2}{17} = 2 \frac{17 - 2}{17} = 2 \frac{15}{17} [/tex]

[tex]3)8 \frac{7}{10} - 3 \frac{2}{5} = 5 \frac{7 - 4}{10} = 5 \frac{3}{10} [/tex]

[tex]4)21 \div 9 = \frac{21}{9} = \frac{7}{3} = 2 \frac{1}{3} [/tex]

или 21÷9=2(остаток 3)

Пошаговое объяснение:

6 - 3 2/17 = 5 17/17 - 3 2/17 = 2 15/17

8 7/10 - 3 2/5 = 8 7/10 - 3 4/10 = 5 3/10

21 : 9 = 21/9 = 7/3 = 2 1/3