\(1\frac{1}{3}.1\frac{1}{4}.1\frac{1}{5}.1\frac{1}{6}.1\frac{1}{7}.1\frac{1}{8}.1\frac{1}{9}.1\frac{1}{10}.1\frac{1}{11}\)
\(=\frac{4}{3}.\frac{5}{4}.\frac{6}{5}.\frac{7}{6}.\frac{8}{7}.\frac{9}{8}.\frac{10}{9}.\frac{11}{10}.\frac{12}{11}\)
\(=\frac{12}{3}=4\)
\(\frac{(1.09-0.29)\times1\frac{1}{4}}{(18.9-16\frac{13}{20})\times\frac{8}{9}}\)
Tính \(A=-\frac{1}{2010}-\frac{1}{2010\times2009}-\frac{1}{2009\times2008}-.....-\frac{1}{3\times2}-\frac{1}{2\times1}\)
giúp mình bài toán này nha mình cần gấp
\(\frac{1}{2003\times2002}+\frac{1}{2002\times2001}+......+\frac{1}{3\times2}+\frac{1}{2\times1}\)
1 a) tìm tập hợp các số nguyên x biết
\(4\frac{5}{9}\div2\frac{5}{18}-7< x< \) \(\left(3\frac{1}{5}\div3,2+4,5\times1\frac{31}{45}\right)\)\(\div\left(-21\frac{1}{2}\right)\)
Cho a, b, c là 3 số thực khác 0
\(\frac{a+b-2017c}{c}=\frac{b+c-2017a}{a}=\frac{c+a-2017b}{b}\)
Tính GTBT: B = \((1+\frac{b}{a}^a)\times(1\times\frac{a}{c})\times1+\frac{b}{c}\)
tìm tập hợp các số nguyên x,biết rằng : 4\(\frac{5}{9}:2\frac{5}{18}\) - 7 <x< ( 3\(\frac{1}{5}:3,2+4,5\)\(\times1\frac{31}{45}\)) : ( - 21\(\frac{1}{2}\))
Tính
P= \(\frac{\frac{6}{8}-\frac{6}{10}+\frac{6}{14}+\frac{6}{26}}{\frac{11}{4}+\frac{11}{5}+\frac{11}{7}+\frac{11}{13}}\)
Q=\(\frac{\frac{9}{1}+\frac{8}{2}+.....+\frac{1}{9}}{\frac{1}{2}+\frac{1}{3}+....+\frac{1}{10}}\)
Tính hợp lí: \(A=\frac{\frac{2}{5}-\frac{2}{9}+\frac{2}{11}}{\frac{7}{5}-\frac{7}{9}+\frac{7}{11}}:\frac{\frac{1}{3}-\frac{1}{4}+\frac{1}{5}}{\frac{7}{6}-\frac{7}{8}+\frac{7}{10}}\)
\(\left(8-\frac{9}{4}+\frac{2}{7}\right)-\left(-6-\frac{3}{7}+\frac{5}{4}\right)-\left(3+\frac{2}{4}-\frac{9}{7}\right)\)\(\frac{9}{7}\))
\(\frac{1}{3}-\frac{3}{5}+\frac{5}{7}-\frac{7}{9}+\frac{9}{11}-\frac{11}{13}+\frac{13}{15}+\frac{11}{13}-\frac{9}{11}+\frac{7}{9}-\frac{5}{7}+\frac{3}{5}-\frac{1}{3}\)
\(\frac{1}{2014}-\frac{1}{2014.2013}-\frac{1}{2013.2012}-\frac{1}{2012.2011}-...-\frac{1}{3.2}-\frac{1}{2.1}\)
