Предмет: Математика, автор: 222sergey222

найдите значение выражения (7/22+14/11) :10/33

Ответы

Автор ответа: MrsVaderr
19

  \displaystyle ( \frac{7}{22} \stackrel{\textit{(1)}}+ \frac{14}{11})\stackrel{\textit{(2)}} : \frac{10}{33} = 5,25

1) Приведем дроби к общему знаменателю 22. При сложении дробей с одинаковыми знаменателями числители дробей складываются, а знаменатель остается неизменным.

 \displaystyle \frac{7}{22}+ \frac{14}{11}= \frac{7}{22}+ \frac{14 \cdot 2}{11 \cdot 2}= \frac{7+28}{22}= \frac{35}{22}

2) Чтобы разделить одну обыкновенную дробь на другую, нужно делимое умножить на число, обратное делителю: (a/b):(c/d)=(a/b)×(d/c).

 \displaystyle \frac{35}{22}: \frac{10}{33}= \frac{35}{22} \cdot \frac{33}{10}=\frac{7 \cdot 3}{2 \cdot 2} = \frac{21}{4}= 5 \frac{1}{4}=5,25

Ответ: 5,25

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