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Bài 2:
\(B=\left(1-\frac{1}{2}\right).\left(1-\frac{1}{3}\right).\left(1-\frac{1}{4}\right).......\left(1-\frac{1}{2004}\right)\)
\(=\frac{1}{2}.\frac{2}{3}.\frac{3}{4}....\frac{2003}{2004}\)
\(=\frac{1}{2004}\)
\(\frac{\left(\frac{3}{15}+\frac{1}{4}+\frac{7}{20}\right)\times\frac{17}{49}}{5\frac{1}{3}+\frac{2}{5}}\)
\(=\frac{\left(\frac{12}{60}+\frac{15}{60}+\frac{21}{60}\right)\times\frac{17}{49}}{\frac{16}{3}\times\frac{2}{5}}\)
\(=\frac{\frac{48}{60}\times\frac{17}{49}}{\frac{80}{15}+\frac{6}{15}}\)
\(=\frac{\frac{816}{2940}}{\frac{86}{15}}\)
\(=\frac{816}{2940}:\frac{86}{15}\)
\(=\frac{816}{2940}\times\frac{15}{86}\)
\(=\frac{68}{245}\times\frac{15}{86}\)
\(=\frac{102}{2107}\)
\(\frac{5}{3}:\left(\frac{7}{28}+\frac{7}{26}\right)\)
\(=\frac{5}{3}:\frac{1}{2}\)
\(=\frac{5}{3}\cdot2\)
\(=\frac{10}{3}\)
\(\frac{5}{3}:\left(\frac{7}{28}+\frac{7}{26}\right)\)
\(=\frac{5}{3}:\left(\frac{182}{728}+\frac{196}{728}\right)\)
\(=\frac{5}{3}:\frac{378}{728}\)
\(=\frac{5}{3}\cdot\frac{728}{378}\)
\(=\frac{260}{81}\)