\(\dfrac{-4}{35}\)

-4/35

bằng 21

        __

        35 

nha em

\(\dfrac{210}{350}=\dfrac{210:70}{350:70}=\dfrac{3}{5}\)

#Hoctot

=3/5

196/210=14/15

tk m nhé

= 14/15 nha

14/15 nhe mk

a, =5/14

b, = 1/6

c, = 3/2

d, = 8/7

5/14

1/6

3/2

8/7

a,5/14

b,1/6

c,3/2

d,8/7

9/10

19/21

9/10

19/21

a.9/10

b.19/21

\(\frac{57}{133}=\frac{57\div19}{133\div19}=\frac{3}{7}\)

\(\frac{189}{210}=\frac{189\div21}{210\div21}=\frac{9}{10}\)

\(\frac{7676}{8484}=\frac{7676\div404}{8484\div404}=\frac{19}{21}\)

lần lượt = 3/7 ; 9/10 ; 19/21

Ta có :

\(\frac{57}{133}=\frac{57:19}{133:19}=\frac{3}{7}\)

\(\frac{189}{210}=\frac{189:21}{210:21}=\frac{9}{10}\)

\(\frac{7676}{8484}=\frac{7676:404}{8484:404}=\frac{19}{21}\)

\(\frac{4}{12}=\frac{1}{3}\)              \(\frac{60}{36}=\frac{5}{3}\)             \(\frac{60}{80}=\frac{3}{4}\)

\(\frac{9}{18}=\frac{1}{2}\)             \(\frac{25}{100}=\frac{1}{4}\)              \(\frac{35}{210}=\frac{1}{6}\)

\(\frac{24}{30}=\frac{4}{5}\)             \(\frac{72}{54}=\frac{4}{3}\)

Bn tự làm đi,bn học rồi mà

4/12=1/3;9/18=1/2;24/30=4/5;60/36=5/3;25/100=1/4;72/54=4/3;60/80=3/4;35/210=1/6

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

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

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

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

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