a)

`6xx(x+9845)=29042xx6`

`6xx(x+9845)=174252`

`x+9845=174252:6`

`x+9845=29042`

`x=29042-9845`

`x=19197`

b)

`(x:3)xx8=8xx3`

`(x:3)xx8=24`

`x:3=24:8`

`x:3=3`

`x=3xx3`

`x=9

Lời giải:

a. 

$6\times (x+9845)=29042\times 6$

$x+9845=29042\times 6:6=29042$

$x=29042-9845=19197$

b.

$(x:3)\times 8=8\times 3$

$(x:3)=8\times 3:8=3$

$x=3\times 3=9$

a) X x 4  =  32                          b) X : 6  =  3                      c) 27 : X = 3

       X        = 32 : 4                          X       = 3 x 6                             X = 27 : 3

       X        = 8                                  X      = 18                                 X = 9

X x 6 = 51924 

      X = 51924 : 6 

      X = 8654   

x : 3 = 7862

x      = 7862 x 3

x      =   23586 

X x 3=6/5+3

=>X x 3=6/5+3/1=6/5+15/5=21/5

=>X x 3=21/5

=>X=21/5 : 3=21/5 x 1/3=7/5

 Vậy, x = 7/5

$\text{x × 3 = $\dfrac{6}{5}$ + 3}$

$\text{x × 3 = $\dfrac{21}{5}$}$

$\text{x = $\dfrac{21}{5}$ ÷ 3}$

$\text{x = $\dfrac{7}{5}$}$

$\text{Vậy x = $\dfrac{7}{5}$}$

x : 5 = 13   x : 6 = 25   x : 3 = 48

x = 13 x 5   x = 25 x 6   x = 48 x 3

x = 65   x = 150   x = 144

a) 12 : x = 3

     X = 12 : 3

     X = 4

b) 21 : x = 7

     X = 21 : 7

     X = 3

c) 30 : x = 3

     X = 30 : 3

     X = 10

d) X : 7 = 4

     X = 4 x 7

     X = 28

e) 20 : x = 5

     X = 20 : 5

     X = 4

f) X x 6 = 42

     X = 42 : 6

     X = 7

a)42.3-x=78

126-x=78

x=48

b)34.4+x=215

136+x=215

x=79

c)x.6=21

x=3,5

d)x:4=48

x=192

42x3-x=78

126-x=78

      x=126-78

      x=48

nhớ chọn cho mình

a) x : 6 = 14

    x = 14 x 6

    x = 84

b) x + 253 = 639

    x = 639 - 253

    x = 386

c) x - 29 = 56 x 3

   x = 56  x 3

   x = 168 + 29

   x = 197