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\(\frac{\frac{7}{2012}+\frac{7}{9}+\frac{1}{4}}{\frac{5}{9}-\frac{3}{2012}-\frac{1}{2}}=\left(\frac{7}{2012}+\frac{7}{9}+\frac{1}{4}\right):\left(\frac{5}{9}-\frac{3}{2012}-\frac{1}{2}\right)\)
\(=\frac{9337}{9054}:\frac{97}{18108}=\frac{9337}{9054}.\frac{18108}{97}=\frac{18674}{97}\)
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\(=\left(\frac{7}{2012}+\frac{7}{9}-1\right):\left(\frac{5}{9}-\frac{3}{2012}-\frac{1}{2}\right)\)
\(=\frac{-3961}{18108}:\frac{979}{18108}=\frac{-3961}{18108}\cdot\frac{18108}{979}\)
\(=\frac{-3961}{979}\)
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\(\frac{2}{3}+\frac{1}{3}\left(\frac{-4}{9}+\frac{5}{6}\right)\div\frac{7}{12}\)
\(=\frac{2}{3}+\frac{1}{3}\left(\frac{-4}{9}+\frac{5}{6}\right)\times\frac{12}{7}\)
\(=\frac{2}{3}+\frac{4}{7}\left(\frac{-4}{9}+\frac{5}{6}\right)\)
\(=\frac{2}{3}+\frac{4}{7}\left(\frac{-8}{18}+\frac{15}{18}\right)\)
\(=\frac{2}{3}+\frac{4}{7}.\frac{-7}{18}\)
\(=\frac{6}{9}+\frac{-2}{9}\)
\(=\frac{4}{9}\)
\(\frac{298}{719}\div\left(\frac{1}{4}+\frac{1}{12}-\frac{1}{3}\right)-\frac{2011}{2012}\)
\(=\frac{298}{719}\div\left(\frac{3}{12}+\frac{1}{12}-\frac{4}{12}\right)-\frac{2011}{2012}\)
\(=\frac{298}{719}\div0-\frac{2011}{2012}\)
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