3/125

3/125

\(\dfrac{75}{1000}=\dfrac{3}{40}\)

\(\dfrac{64}{1000}=\dfrac{64:8}{1000:8}=\dfrac{8}{125}\)

\(\text{Giải:}\)

\(\frac{678}{1000}=\frac{678:2}{1000:2}=\frac{339}{500}\)

\(\text{Hoc tốt!!!}\)

\(\frac{678}{1000}\) 

\(=\frac{339\cdot2}{500\cdot2}\) 

\(=\frac{339}{500}\) 

\(\dfrac{250}{1000}=\dfrac{250:250}{1000:250}=\dfrac{1}{4}\)

`250/1000=(250:250)/(1000:250)=1/4`

816/1000 = 102/125
373737/191919 = 37/19

\(\dfrac{3}{8}\)

\(\dfrac{7}{13}\)

\(\dfrac{2}{3}\)

\(\dfrac{1}{2}\)

\(\dfrac{3}{125}\)

\(\dfrac{15}{40}\) = \(\dfrac{3}{8}\) rút gọn cho 5

\(\dfrac{21}{39}\) = \(\dfrac{7}{13}\) rút gọn cho 3

\(\dfrac{16}{24}\) = \(\dfrac{4}{6}\) rút gọn cho 4

\(\dfrac{36}{72}\) = \(\dfrac{4}{8}\) rút gọn cho 9

\(\dfrac{24}{1000}\) = \(\dfrac{3}{125}\) rút gọn cho 8

Giả sử tử là a => mẫu là a+14, ta có:
\(\frac{a}{a+14}=\frac{999}{1000}\Rightarrow999\left(a+14\right)=1000a\Leftrightarrow a=13986\)
Vậy phân số đó là 13986/14000

\(\frac{15}{40}\)= \(\frac{3}{8}\)

\(\frac{21}{39}\)= \(\frac{7}{13}\)

\(\frac{16}{24}\)= \(\frac{4}{6}\)= \(\frac{2}{3}\)

\(\frac{36}{72}\)= \(\frac{1}{2}\)

\(\frac{24}{1000}\)= \(\frac{12}{500}\)= \(\frac{6}{250}\)= \(\frac{3}{125}\)

15/40=3/8

21/39=7/13

16/24=2/3

36/72=1/2

24/1000=3/125