помогите пожалуйста N 635 б). Created by nika78905. matematika-ru

1. - = 2. + 3. 4. 5. 0,5 + 2,5 = 3

помогите пожалуйста N 635 б)...

maiskii99 1. $\frac{3}{2}$ - $\frac{2}{5}$ = $\frac{11}{10}$
2. $\frac{3}{4}$ + $\frac{5}{6}$ $= \frac{19}{12}$
3. $\frac{11}{4} * \frac{10}{11} = \frac{10}{4} = 2,5$
4. $\frac{19}{12} * \frac{6}{19} = \frac{1}{2} = 0,5$
5. 0,5 + 2,5 = 3

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elenachesnokova 1) 1 $\frac{1}{2}- \frac{2}{5} = \frac{3}{2} - \frac{2}{5} = \frac{15}{10} - \frac{4}{10}= \frac{11}{10}$
2) $\frac{3}{4} + \frac{5}{6}= \frac{9}{12}+ \frac{10}{12}= \frac{19}{12}$
3)2 $\frac{3}{4} : \frac{11}{10}= \frac{11}{4}$ · $\frac{10}{11} = \frac{5}{2} =2 \frac{5}{10}$
4) $\frac{19}{12}:3 \frac{1}{6} = \frac{19}{12} : \frac{19}{6} = \frac{19}{12}$ · $\frac{6}{19}= \frac{1}{2}$
5)2 $\frac{5}{10} + \frac{1}{2} =2 \frac{5}{10}+ \frac{5}{10} =2 \frac{10}{10}=3$

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pozhalujsta pomogite n 686

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