\(\frac{\frac{1}{77}-\frac{1}{777}-\frac{1}{7951}}{\frac{4}{77}-\frac{4}{777}-\frac{4}{7951}}=\frac{\frac{1}{77}-\frac{1}{777}-\frac{1}{7951}}{4.\left(\frac{1}{77}-\frac{1}{777}-\frac{1}{7951}\right)}=\frac{1}{4}\)
\(\frac{1}{2}+\frac{2}{8}+\frac{3}{28}+\frac{4}{77}+\frac{5}{176}\)
Tính \(D=\frac{2}{45}+\frac{1}{99}-\frac{2}{77}+\frac{4}{105}\)
Tính nhanh
A=\(\frac{3}{1}\)* 4 +\(\frac{3}{4}\)* 7 +\(\frac{3}{7}\)* 10 +...+\(\frac{3}{205}\)* 208
B=\(\frac{77}{2}\)* 9 +\(\frac{77}{9}\)* 16 +\(\frac{77}{16}\)* 23 +...+\(\frac{77}{93}\)* 100
C=\(\frac{7}{1}\)* 5 +\(\frac{7}{5}\)* 9 +\(\frac{7}{9}\)* 13 +\(\frac{7}{13}\)* 17 +\(\frac{7}{17}\)* 21
Các bạn giúp mình với nha , mình đang cần gấp
\(D=\frac{4}{21}+\frac{4}{77}+\frac{4}{165}+\frac{4}{285}+\frac{4}{437}+\frac{4}{621}\)
Rút gọn:
\(\frac{2016-\frac{1}{2}-\frac{1}{3}-\frac{1}{4}-...-\frac{1}{2017}}{\frac{1}{2}+\frac{2}{3}+\frac{3}{4}+...+\frac{2015}{2016}}\)
Rút gọn các phân số sau:
\(\frac{44}{77};\frac{-40}{56};\frac{143}{-195};\frac{-2121}{3434};\frac{353535}{-494949};\frac{56565656}{63636363}\)
Rút gọn:
a/ \(\frac{555}{777}\) b/ \(\frac{555...5}{777...7}\)
c/ \(\frac{2323}{3737}\) d/ \(\frac{15151515}{29292929}\)
e/ \(\frac{18181818181818}{32323232323232}\)
Mong các bạn giúm mìnk nha \(\frac{1011+1014+\frac{2015}{777}+\frac{2015}{888}-\frac{1011}{999}-\frac{1014}{999}}{201+202+\frac{403}{777}-\frac{403}{888}-\frac{201}{999}-\frac{202}{999}}\)
Rút gọn:
\(\frac{\frac{7}{2012}+\frac{7}{9}-\frac{1}{4}}{\frac{5}{9}-\frac{3}{2012}-\frac{1}{4}}\)
