rảnh à

100

giúp mik nhé cám ơn

=28

câu 1 đáp án bằng 6 / 7,câu 2 đáp án bằng 1

1, 54 : x - 1 = 5

54 : x = 5+1 = 6

x = 54 : 6 = 9

2, 42 : x + 0 = 8

x = 42 : 8 = 21/4

3, 24 : x - 8 = 0

24 : x = 0 + 8 = 8

x = 24 : 8 = 3

Tk mk nha

1) 54:x-x:x=3x2-1

    54:x-  1 =6-1

    54:x-   1=5

    54:x      =6

         x=54:6=9

\(6-2\left(x-1\right)=4\)

\(\Rightarrow2\left(x-1\right)=6-4\)

\(\Rightarrow2\left(x-1\right)=2\)

\(\Rightarrow x-1=1\)

\(\Rightarrow x=1+1=2\)

________________

\(2\cdot\left(x-2\right)+1=7\)

\(\Rightarrow2\cdot\left(x-2\right)=7-1\)

\(\Rightarrow2\cdot\left(x-2\right)=6\)

\(\Rightarrow x-2=3\)

\(\Rightarrow x=3+2=5\)

_______________

\(\left(2\cdot x-3\right)+4=9\)

\(\Rightarrow2\cdot x-3=5\)

\(\Rightarrow2\cdot x=3+5\)

\(\Rightarrow2\cdot x=8\)

\(\Rightarrow x=\dfrac{8}{2}=4\)

________________

\(\left(3\cdot x-2\right)-1=3\)

\(\Rightarrow3\cdot x-2=3+1\)

\(\Rightarrow3\cdot x-2=4\)

\(\Rightarrow3\cdot x=6\)

\(\Rightarrow x=\dfrac{6}{3}=2\)

a: =>2(x-1)=2

=>x-1=1

=>x=2

b: =>2(x-2)=6

=>x-2=3

=>x=5

c; =>2x-3=5

=>2x=8

=>x=4

d: =>3x-2=4

=>3x=6

=>x=2

e: =>2(6-x)=4

=>6-x=2

=>x=4

f: =>x-2=5

=>x=7

g: =>10-2x=4

=>2x=6

=>x=3

h: =>2x+4=3

=>2x=-1

=>x=-1/2

j: =>x+2=12

=>x=10

l: =>2x+3=3

=>2x=0

=>x=0

a) x* 1/5 - x* 2 * 2/15 = 4

   x * 1/5 - x * 2 = 4 : 2/15

   x * 15 - x * 2 = 30

   x * ( 15 - 2 ) = 30

   x * 13 = 30

        x = 30 : 13

        x = 30/13

 b) ( x + x * 2 ) - 3 : 1/2 = 8

     ( x * 1 + x * 2 ) - 3 = 8 x 1/2

     ( x * 1 + x * 2 ) - 3 = 4

       x * 1 + x * 2 = 4 + 3 

       x * 1 + x * 2 = 7

       x * ( 1 + 2 ) = 7

       x * 3 = 7

            x = 7 : 3

            x = 7/3

c)5 +( x * 1/2 - 4 ) = 15

    x * 1/2 - 4 = 15 - 5

    x * 1/2 - 4 = 10

    x * 1/2 = 10 + 4

    x * 1/2 = 14

          x = 14 : 1/2 

          x = 7

a)x*1/5-x*2*2/15=4

x*1/5-x*4/15=4

x*1/5-4/15=4

x*(-1/15)=4

x=4:-1/15

x=-60