em muốn nhanh thì lần sau em tách câu hỏi ra chứ đừng hỏi nhiều trong một câu em nhé

\(\dfrac{12}{48}\) = \(\dfrac{12:12}{48:12}=\)  \(\dfrac{1}{2}\)                            \(\dfrac{49}{140}\) = \(\dfrac{49:7}{140:7}\) = \(\dfrac{7}{20}\)

\(\dfrac{125}{1000}\) = \(\dfrac{125:125}{1000:125}\) = \(\dfrac{1}{8}\)               \(\dfrac{352}{253}\) = \(\dfrac{352:11}{253:11}\)= \(\dfrac{32}{23}\)

\(\dfrac{75}{300}=\) \(\dfrac{75:75}{300:75}\) = \(\dfrac{1}{4}\)                 \(\dfrac{561}{132}\) = \(\dfrac{561:33}{132:33}\) = \(\dfrac{17}{4}\)

Giúp mình nhanh với ạ

mình cần gấp .

=5/28

\(\dfrac{25}{64}\)

\(\dfrac{25}{64}\)

\(\dfrac{15}{125}=\dfrac{3}{25}\)

\(\dfrac{15}{125}=\dfrac{15:5}{125:5}=\dfrac{3}{25}\)

\(\frac{3}{9}=\frac{3:3}{9:3}=\frac{1}{3}\)

\(\frac{28}{40}=\frac{28:4}{40:4}=\frac{7}{10}\)

\(\frac{100}{200}=\frac{100:100}{200:100}=\frac{1}{2}\)

\(\frac{70}{75}=\frac{70:5}{75:5}=\frac{14}{15}\)

#hoctot

\(\frac{3}{9}=\frac{1}{3}\)

\(\frac{28}{40}=\frac{7}{10}\)

\(\frac{100}{200}=\frac{1}{2}\)

\(\frac{70}{75}=\frac{14}{15}\)

#Học tốt#

\(\frac{125}{2000}=\frac{125:125}{2000:125}=\frac{1}{16}\)

 rut gon bang : 

        1 phan  16

Bài làm:

\(\frac{215}{300}=\frac{43}{60}\)

\(\frac{1200}{2010}=\frac{40}{67}\)

\(\frac{105}{420}=\frac{1}{4}\)

\(\frac{125}{420}=\frac{25}{84}\)

#Học_tốt

\(\dfrac{215}{300}\) = \(\dfrac{215:5}{300:5}\) = \(\dfrac{43}{60}\)

\(\dfrac{1200}{2010}\) = \(\dfrac{1200:30}{2010:30}\) = \(\dfrac{40}{67}\)

\(\dfrac{105}{420}\)  = \(\dfrac{105:105}{420:105}\) = \(\dfrac{1}{4}\)

\(\dfrac{125}{420}\) = \(\dfrac{125:5}{420:5}\) = \(\dfrac{25}{84}\)

75/200 = 3/8                                                            36/84 = 3/7

34/51 = 2/3                                                               117/243 = 13/27

\(\frac{75}{200}\)=\(\frac{3}{8}\); \(\frac{34}{51}\)=\(\frac{2}{3}\);\(\frac{36}{84}\)=\(\frac{3}{7}\); \(\frac{117}{243}\)=\(\frac{13}{27}\)

Đây nha bạn :))

a, \(\dfrac{2}{3}\)

b, \(\dfrac{8}{5}\)