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dobra888

Пошаговое объяснение:

$1)\ 10\frac{5}{6} +(5\frac{1}{3}-2\frac{1}{6})=\frac{65}{6}+(\frac{16}{3}-\frac{13}{6})=\frac{65}{6}+\frac{16*2-13}{6}=\frac{65+32-13}{6} =\frac{84}{6}=14.\\2)\ 12\frac{5}{12}-(3\frac{4}{5} +5\frac{5}{6})=\frac{149}{12} -(\frac{19}{5}+\frac{35}{6})=\frac{149}{12} -\frac{19*6+35*5}{30}=\frac{149}{12} -\frac{114+175}{30}=\\=\frac{149}{12}-\frac{289}{30}=\frac{149*5-289*2}{60}=\frac{745-578}{60} =\frac{167}{60}= 2\frac{47}{60} .$

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sangers1959

Verified answer

Ответ:

Пошаговое объяснение:

19.21 . 1) 10 5/6 + ( 5 1/3 - 2 1/6 ) = 10 5/6 + ( 5 2/6 - 2 1/6 ) = 10 5/6 +

+ 3 1/6 = 13 6/6 = 14 ;

2) 12 5/12 - ( 3 4/5 + 5 5/6 ) = 12 5/12 - 8 49/30 = 12 5/12 - 9 19/30 = 11 17/12 -

- 9 19/30 = 2 47/60 .

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