Question

№1238.Вычислите:

а) $1 - \frac{25}{28}$

б) $9 - \frac{4}{21}$

в) $10 - 8 \frac{1}{7}$

г) $11 - 1 \frac{5}{8}$
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Answer 1

а)

$1 - \frac{25}{28} = \frac{28}{28} - \frac{25}{28} = \frac{3}{28}$

б)

$9 - \frac{4}{21} = \frac{189}{21} - \frac{4}{21} = \frac{185}{21} = 8 \frac{17}{21}$

в)

$10 - 8 \frac{1}{7} = 10 - \frac{57}{7} = \frac{70}{7} - \frac{57}{7} = \frac{13}{7 } = 1 \frac{6}{7}$

г)

$11 - 1 \frac{5}{8} = 11 - \frac{13}{8} = \frac{88}{8} - \frac{13}{8} = \frac{75}{8} = 9 \frac{3}{8}$