\(\dfrac{x}{5}=\dfrac{26}{65}\)

\(\dfrac{x}{5}=\dfrac{2}{5}\)

\(x=2\)

______________________________________________

\(\dfrac{3}{x}=\dfrac{51}{85}\)

\(\dfrac{3}{x}=\dfrac{3}{5}\)

`x=5`

\(+,\dfrac{x}{5}=\dfrac{26}{65}\\ =>x=\dfrac{5\times26}{65}=2\\+, \dfrac{3}{x}=\dfrac{51}{85}\\ =>x=\dfrac{3\times85}{51}=5\)

\(a,\dfrac{x}{4}=\dfrac{15}{20}\\ \Rightarrow\dfrac{x}{4}=\dfrac{3}{4}\\ \Rightarrow x=3\\ b,\dfrac{15}{x}=\dfrac{25}{35}\\ \Rightarrow\dfrac{15}{x}=\dfrac{5}{7}\\ \Rightarrow\dfrac{15}{x}=\dfrac{15}{21}\\ \Rightarrow x=21\\ c,\dfrac{x}{5}=\dfrac{26}{65}\\ \Rightarrow\dfrac{x}{5}=\dfrac{2}{5}\\ \Rightarrow x=2\\ d,\dfrac{3}{x}=\dfrac{51}{85}\\ \Rightarrow\dfrac{3}{x}=\dfrac{3}{5}\\ \Rightarrow x=5\)

a,x4=1520⇒x4=34⇒x=3b,15x=2535⇒15x=57⇒15x=1521⇒x=21c,x5=2665⇒x5=25⇒x=2

51/85=39/65

15/21=25/35

\(\dfrac{51}{85}=\dfrac{39}{65}\)

\(\dfrac{15}{21}=\dfrac{25}{35}\)

26/39=38/57

55/77=25/35

39/65=51/85

kb với mình nha

Ban oi trình bay cả cách làm nữa nhé 

26/39 = 38/57

55/77 = 25/35

39/65 = 51/85

\(\frac{26}{39}=\frac{38}{57}\)

\(\frac{26}{39}=\frac{2}{3}\)

\(\frac{55}{77}=\frac{5}{7}\)

\(\frac{39}{65}=\frac{3}{5}\)

\(\frac{51}{85}=\frac{3}{5}\)

\(\frac{38}{57}=\frac{2}{3}\)
Các phân số bằng nhau là:

\(\frac{39}{65}=\frac{51}{85}\left(=\frac{3}{5}\right)\)

\(\frac{26}{39}=\frac{38}{57}\left(=\frac{2}{3}\right)\)

\(\frac{26}{39}=\frac{38}{57}\)

\(\frac{55}{77}=\frac{39}{56}\)

ko biết đúng ko

cho mk xin ý kiến các bạn

................................

26/39 = 2/3

55/77 = 5/7

39/65 = 3/5

25/35 = 5/7

51/85 = 3/5

38/57 = 2/3

=> 26/39 = 38/57 

55/77 = 35/35 

39/65 = 51/85

hok tốt

26/39 = 2/3

55/77 = 5/7

39/65 = 3/5

25/35 = 5/7

51/85 = 3/5

38/57 = 2/3

=> 26/39 = 38/57 

55/77 = 35/35 

39/65 = 51/85

\(\frac{26}{39}=\frac{2}{3}\)

\(\frac{55}{77}=\frac{5}{7}\)

\(\frac{25}{35}=\frac{5}{7}\)

\(\frac{51}{85}=\frac{3}{5}\)

\(\frac{38}{57}=\frac{2}{3}\)

\(=>\frac{26}{39}=\frac{38}{57},...,...\)

247858

a)  

\(\dfrac{1}{2}=0,5;\dfrac{3}{4}=0,75;\dfrac{7}{5}=1,4;\dfrac{9}{8}=1,125;\dfrac{26}{25}=1,04;\dfrac{120}{125}=0,96\)

b) 

\(\dfrac{15}{25}=0,6;\dfrac{75}{25}=3;\dfrac{90}{300}=0,3;\dfrac{27}{36}=0,75;\dfrac{51}{85}=0,6\)

a,1/2=5/10;3/4=75/100;7/5=140/100;26/25=108/100;120/125=960/1000

b,15/25=60/100;75/25=300/100;90/300=3/10;27/36=3/4=75/100;

51/85=3/5=60/100;39/65=3/5=60/100

a) 0,5; 0,75; 1,4; 1,125; 1,04; 0,96; 0,6

b) 0,6; 3,0; 0,3; 0,75; 0,6