Question

Bài 1:Tìm x để có các phân số bằng nhau: 

2/3 =12/x , 24/36 = x/12 , 14/56 = 1/x ,

 x/125 = 2/5

Answer 1

a: 2/3=12/x

=>12/x=2/3

hay x=18

b: =>x/12=2/3

hay x=8

c: =>1/x=1/4

hay x=4

d: =>x/125=2/5

nên x=50

Answer 2

a, \(\dfrac{12}{18}=\dfrac{12}{x}\Rightarrow x=18\)

b, \(\dfrac{24}{36}=\dfrac{3x}{36}\Rightarrow3x=24\Leftrightarrow x=8\)

c, \(\dfrac{14}{56}=\dfrac{14}{14x}\Rightarrow14x=56\Leftrightarrow x=4\)

d, \(\dfrac{x}{125}=\dfrac{50}{125}\Rightarrow x=50\)

Answer 3

 x = 18

 x = 8

 x = 4

 x = 50

Answer 4

\(+\text{)}\dfrac{2}{3}=\dfrac{12}{x}\Rightarrow x=\dfrac{12.3}{2}=18\)

\(+\text{)}\dfrac{24}{36}=\dfrac{x}{12}\Leftrightarrow\dfrac{2}{3}=\dfrac{x}{12}\Rightarrow x=\dfrac{12.2}{3}=8\)

\(+\text{)}\dfrac{14}{56}=\dfrac{1}{x}\Leftrightarrow\dfrac{1}{4}=\dfrac{1}{x}\Rightarrow x=4\)

\(+\text{)}\dfrac{x}{125}=\dfrac{2}{5}\Rightarrow x=\dfrac{125.2}{5}=50\)