Tinh:

\(B=\frac{\frac{1}{7}+\frac{1}{23}-\frac{1}{1009}}{\frac{1}{7}+\frac{1}{23}-\frac{1}{1009}+\frac{1}{7}.\frac{1}{23}.\frac{1}{1009}}\)

Trinh bay cach lam nua nhe

Co gi ko hieu thi vao phan doc them

Tinh :

A=\(\left(1+\frac{1}{1.3}\right)\left(1+\frac{1}{2.4}\right)\left(1+\frac{1}{3.5}\right)....\left(1+\frac{1}{2014.1016}\right)\)

Giup minh trinh bay ca cach lam nua nha!

Ai chua doc het de va ko hieu thi vao phan "Doc them" se ro

Thanks

Tinh :

A=\(\left(1+\frac{1}{1.3}\right)\left(1+\frac{1}{2.4}\right)\left(1+\frac{1}{3.5}\right)......\left(1+\frac{1}{2014.2016}\right)\)

Giup minh trinh bay ca cach lam nua nha!

Ai chua doc het de va ko hieu thi vao phan "Doc them" se ro

Thanks

Tinh 

D=  \(\frac{\frac{1}{3}+\frac{1}{17}-\frac{1}{13}}{\frac{2}{3}+\frac{2}{17}-\frac{2}{13}}.\frac{\frac{3}{4}-\frac{3}{16}+\frac{3}{64}-\frac{3}{256}}{1-\frac{1}{4}+\frac{1}{16}-\frac{1}{64}}+\frac{5}{8}\)

Trinh bay cach lam nhe

Ko hieu vao DOC THEM

So sanh A va B biet: A=\(\frac{2010}{2011}+\frac{2011}{2012}+\frac{2012}{2010}\)                                                                                      va B=\(\frac{1}{3}+\frac{1}{4}+\frac{1}{5}+...+\frac{1}{17}\)

Trinh bay cach lam cho minh voi nhe

Ai ko hieu thi vao phan "Doc them"

Giup minh voi nhe!Please

tim x biet:

\(\frac{x-5}{1990}+\frac{x-15}{1980}+\frac{x-25}{1970}=\frac{x-1990}{5}+\frac{x-1980}{15}+\frac{x-1970}{25}\)

trinh bay cach giai ho minh nhe

co gi ko hieu thi vao cho"doc them"

Tinh gia tri cua bieu thuc \(D=\frac{1}{6}+\frac{1}{10}+\frac{1}{15}+\frac{1}{21}+\frac{1}{28}+\frac{1}{36}+\frac{1}{45}\)

Nho giai va trinh bay cach lam cho minh luon nha ^_^

trong cac cach viet sau cach viet nao cho ta phan so \(\frac{4}{7};\frac{5}{0};\frac{1,2}{7};\frac{-3}{4};\frac{1}{-5};\frac{2,123}{3,4};\frac{1,2}{7};\frac{-3}{4}\)

CMR:

\(\frac{1}{3}+\frac{1}{4}+\frac{1}{5}+...+\frac{1}{32}>2\)

KO hieu vao phan "Doc them"