Question

a, 3-x=x-5                  b, 7x+21=0                  c, 0,25x+1,5=0                         d, 6,36-5,3x=0

e, 3x+1=7x-11           f, 15-4x=6x+5                g, 2(x+1)=3+2x                       

h, 3(1-x)+4x-3 = 0

Answer 1

a: =>-2x=-8

hay x=4

b: =>7x=-21

hay x=-3

c: =>0,25x=-1,5

hay x=-6

d: =>5,3x=6,36

hay x=6/5

e: =>-4x=-12

hay x=3

f: =>-10x=-10

hay x=1

g: =>2x+2-3-2x=0

=>-1=0(vô lý)

h: =>3-3x+4x-3=0

=>x=0

Answer 2

a,

\(3-x=x-5\\ \Leftrightarrow3x-x+5=0\Leftrightarrow2x+5=0\)

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

 

b, \(\Rightarrow x=-\dfrac{21}{7}=-3\)

 

c, \(\Leftrightarrow x=\left(0-1,5\right):0,25=-6\)

Answer 3

a. <=> 2x=8 hay x=4

b.<=> x= -21/7 = -3

c. <=> x= -1,5/ 0,25=-6

d. <=> x= -6,36/-5,3=1,2

e.<=> 4x=12 hay x= 3

f. <=> 10x = 10 hay x = 1

g. <=> 2x +2 = 3 + 2x

<=> 2=3 ( vô lí )

h.<=> 3 - 3x + 4x -3 =0

<=> x=0

Answer 4

6,

\(\Leftrightarrow5,3x=36\Rightarrow x=36:5,3=\dfrac{360}{53}\)

 

e,

\(\Leftrightarrow3x+1-7x+11=0\Leftrightarrow12-4x=0\)

\(\Rightarrow x=3\)

Answer 5

a -x - x = -5 - 3

-2x = -8

x = 4

b 7x = -21

x = -3

c 0.25x = -1.5

x = -6

d -5.3x = -6.36

x=1.2

e 3x - 7x =-11-1

-4x = -12

x = 3

f -4x -6x = 5 - 15

-10x = -10

x = 1

h 3 - 3x +4x - 3 = 0

x = 0