Вычислите: 81/88 * (6 целых - 1целая 13/15 * 1целую 19/21) / - это дробь. Created by Anna25704. matematika-ru

- это дробь...

BirdDuo $\frac{81}{88}*(6 -1\frac{13}{15} *1 \frac{19}{21})=\frac{81}{88}*(6 -\frac{28}{15} *\frac{40}{21})= \frac{81}{88}*( \frac{6}{1} -\frac{4}{3} *\frac{8}{3})=$ $\frac{81}{88}*( \frac{6}{1} -\frac{32}{9})= \frac{81}{88}*( \frac{54}{9} - \frac{32}{9} )= \frac{81}{88} * \frac{22}{9} = \frac{9}{4} * \frac{1}{1} =2\frac{1}{4} =2,25$

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