Question

Решите выражения:
3,4/7 - 2,3/5
6,5/6 + 2,3/8
4,5/14 + (5,1/12 - 3,4/21)

Answer 1

Пошаговое объяснение:

$ttdisplaystyle [3frac{4}{7}-2frac{3}{5}=3frac{{20}}{{35}}-2frac{{21}}{{35}} = 2frac{{55}}{{35}}-2frac{{21}}{{35}}=frac{{34}}{{35}}]$

$ttdisplaystyle[6frac{5}{6} + 2frac{3}{8} = 6frac{{20}}{{24}} + 2frac{9}{{24}} = 8frac{{29}}{{24}} = 9frac{5}{{24}}]$

$[begin{gathered}4frac{5}{{14}}+left( {5frac{1}{{12}}-3frac{4}{{21}}}right)=4frac{{30}}{{84}}+left( {5frac{7}{{84}}-3frac{{16}}{{84}}}right)=4frac{{30}}{{84}}+left( {4frac{{91}}{{84}} - 3frac{{16}}{{84}}} right)=hfill\=4frac{{30}}{{84}}+1frac{{75}}{{84}}=5frac{{105}}{{84}}=6frac{{21}}{{84}}=6frac{1}{4} hfill\ end{gathered}]$