Question

Tìm x biết:  a) x + \(\dfrac{2}{3}=\dfrac{4}{27}\)              b) \(\dfrac{3}{4}x-\dfrac{7}{3}=\dfrac{1}{4}x+\dfrac{1}{6}\)  

c) \(\dfrac{13}{10}x-\dfrac{5}{2}=\dfrac{7}{2}\)                             d) (3\(x\) + 2) \(\left(\dfrac{-2}{5}x-7\right)=0\) 

Answer 1

a: x=4/27-2/3=4/27-18/27=-14/27

b: =>3/4x-1/4x=1/6+7/3

=>1/2x=1/6+14/6=5/2

hay x=5

c: =>13/10x=7/2+5/2=6

=>x=13/10:6=13/60

d: (3x+2)(-2/5x-7)=0

=>3x+2=0 hoặc 2/5x+7=0

=>x=-2/3 hoặc x=-35/2

Answer 2

a) x = 4/27 - 2/3

    x = -14/27

Answer 3

a: x=4/27-2/3=4/27-18/27=-14/27

b: =>3/4x-1/4x=1/6+7/3

=>1/2x=1/6+14/6=5/2

hay x=5

c: =>13/10x=7/2+5/2=6

=>x=13/10:6=13/60

d: (3x+2)(-2/5x-7)=0

=>3x+2=0 hoặc 2/5x+7=0

=>x=-2/3 hoặc x=-35/2

Answer 4

b)3/4 x - 1/4 x = 1/6 + 7/3

1/2 x = 1/6 + 14/6

1/2 x = 15/6 = 5/2

      x = 5/2 : 1/2

      x = 5

 

 

Answer 5

c) 13/10 x = 7/2 + 5/2

    13/10 x = 6

     x = 6 : 13/10

     x = 6 . 10/13

     x = 60/13