а) (1-1/2) : (1/2-1/3)= в) 3/4 : (1-1/4+3/8)=. Created by iphone89. matematika-ru

А) 1) 2) 3) Ответ: 3в) 1) 2) Ответ:

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а) (1-1/2) : (1/2-1/3)=
в) 3/4 : (1-1/4+3/8)=

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Влад343 А) $(1- \frac{1}{2} ) : ( \frac{1}{2} - \frac{1}{3} )$
1) $1- \frac{1}{2} = \frac{2}{2} - \frac{1}{2} = \frac{1}{2}$
2) $\frac{1}{2} - \frac{1}{3} = \frac{3}{6} - \frac{2}{6} = \frac{1}{6}$
3) $\frac{1}{2} : \frac{1}{6} = \frac{1}{2} * \frac{6}{1} = \frac{3}{1} = 3$
Ответ: 3

в) $\frac{3}{4} : (1- \frac{1}{4} + \frac{3}{8} )$
1) $1- \frac{1}{4} + \frac{3}{8} = \frac{8}{8} - \frac{2}{8} + \frac{3}{8} = \frac{9}{8} = 1 \frac{1}{8}$
2) $\frac{3}{4} : 1 \frac{1}{8} = \frac{3}{4} : \frac{9}{8} = \frac{3}{4} * \frac{8}{9} = \frac{2}{3}$
Ответ: $\frac{2}{3}$

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