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theo đề ra ta có Q=\(\left(\frac{51}{2}.\frac{52}{2}...\frac{100}{2}\right):\left(1.3....99\right)\)\(=\frac{1.2.3...50}{1.2.3...50}.\frac{51.52...100}{2.2.2....2.2}.\frac{1}{1.3....99}\)(50 thừa số 2)
\(=\frac{\left(1.2.3...50\right).\left(51.52...100\right).1}{\left(1.2.3...50\right).\left(2.2.2...2\right).\left(1.3...99\right)}\)\(=\frac{1.2.3.4....100}{\left(2.4.6.8..100\right).\left(1.3....99\right)}=\frac{1.2.3...100}{1.2.3...100}\)\(=1\)
các bạn thấy hay thì k cho mik nha
\(\frac{3^{10}.\left(-5\right)^{21}}{\left(-5\right)^{20}.3^{12}}=\frac{3^{10}.\left(-5\right)^{20}.\left(-5\right)}{\left(-5\right)^{20}.3^{10}.3^2}=\frac{-5}{3^2}=-\frac{5}{9}\)
(1-1/3).(1-1/5).(1-1/7).(1-1/9).(1-1/11).(1-1/13).(1-1/2).(1-1/4).(1-1/6).(1-1/8).(1-1/10)
=2/3.4/5.6/7.8/9.10/11.12/13.1/2.3/4.5/6.7/8.9/10
=8/15.48/63.120/143.3/8.35/48.9/10
=384/945.360/1144.315/480
=138240/1081080.315/480
=43545600/518918400=84/1001
\(\left(\frac{-3}{42}+\frac{10}{-21}-\frac{-9}{14}\right).\left(\frac{-7}{5}\right).\)
\(=\left(\frac{-1}{14}-\frac{10}{21}+\frac{9}{14}\right).\left(\frac{-7}{5}\right)\)
\(\left(\frac{12}{21}-\frac{10}{21}\right).\left(\frac{-7}{5}\right)=\frac{2.\left(-7\right)}{21.5}=\frac{-2}{15}\)
