H = 10/56 + 10/140 + 10/260 + ... + 10/1400

H = 5/3 × (3/28 + 3/70 + 3/130 + ... + 3/700)

H = 5/3 × (3/4×7 + 3/7×10 + 3/10×13 + ... + 3/25×28)

H = 5/3 × (1/4 - 1/7 + 1/7 - 1/10 + 1/10 - 1/13 + ... + 1/25 - 1/28)

H = 5/3 × (1/4 - 1/28)

H = 5/3 × 3/14

H = 5/14

\(H=\frac{10}{56}+\frac{10}{140}+\frac{10}{260}+....+\frac{10}{1400}\)

   \(=\frac{5}{4.7}+\frac{5}{7.10}+\frac{5}{10.13}+....+\frac{5}{25.28}\)

   \(=\frac{5}{3}.\left(\frac{3}{4.7}+\frac{3}{7.10}+\frac{3}{10.13}+....+\frac{3}{25.28}\right)\)

    \(=\frac{5}{3}.\left(\frac{1}{4}-\frac{1}{7}+\frac{1}{7}-\frac{1}{10}+....+\frac{1}{25}-\frac{1}{28}\right)\)

     \(=\frac{5}{3}.\left(\frac{1}{4}-\frac{1}{28}\right)\)

     \(=\frac{5}{3}.\frac{3}{14}=\frac{5}{14}\)

\(H=\frac{10}{56}+\frac{10}{140}+\frac{10}{260}+.....+\frac{10}{1400}\)

\(=\frac{5}{3}\times\left(\frac{3}{28}+\frac{3}{70}+....+\frac{3}{700}\right)\)

\(=\frac{5}{3}\times\left(\frac{3}{4}\times7+\frac{3}{7}\times10+.....+\frac{3}{25}\times28\right)\)

\(=\frac{5}{3}\times\left(\frac{1}{4}-\frac{1}{7}+\frac{1}{7}-....+\frac{1}{25}-\frac{1}{28}\right)\)

\(=\frac{5}{3}\times\left(\frac{1}{4}-\frac{1}{28}\right)\)

\(=\frac{5}{3}\times\frac{3}{14}=\frac{5}{14}\)

Không rút gọn được nữa đâu em nhé

Ko rút gọn được

Tối giản rồi bn

rút 

gọn

đc

bằng

1/2 

nha

có

1/20

TL:

\(\frac{50}{100}=\frac{50:50}{100:50}=\frac{1}{2}\)

_HT_

\(A=\frac{132639}{173451}\)

\(A=\frac{132639:10203}{173451:10203}\)

\(A=\frac{13}{17}\)

\(B=\frac{16515}{20919}\)

\(B=\frac{16515:1101}{20919:1101}\)

\(B=\frac{15}{19}\)

 anh em đăng kí nhé cảm ơn https://www.youtube.com/shorts/hhpTDItpePY

\(\dfrac{4}{11}\) nha bạn

tick mik

`26/54=(26:2)/(54:2)=13/27`

\(\dfrac{26}{54}=\dfrac{26:2}{54:2}=\dfrac{13}{27}\)

Rút gọn phân số12 Phần 26

1010/1009 nhé

1010/1009 bạn nha

tích cho mik ạ

AI TRẢ LỜI MIK CHO TIK:3

số này ko rút gọn được nữa

ồ