X x 13 = 39

X = 39 : 13

X = 3

( x - 15 ) - 75 = 0

x - 15 = 0 + 75

x - 15 = 75

x = 75 + 15

x = 90

6x - 39 = 201

6x = 201 + 39

6x = 240

x = 40

X x 13 = 39

X = 39 : 13

X = 3

( x - 15 ) - 75 = 0

x - 15 = 0 + 75

x - 15 = 75

x = 75 + 15

x = 90

6x - 39 = 201

6x = 201 + 39

6x = 240

x = 240 : 6

x = 40

575 - ( 6x +70 ) = 445

6x + 70 = 575 - 445

6x + 70 = 130

6x = 130 - 70

6x = 60

x = 60 : 6

x = 10

X x 13 = 39

X = 39 : 13

X = 3

( x - 15 ) - 75 = 0

x - 15 = 75

x = 75 - 15

x = 50

6x  - 39 = 201

6x = 162

x = 162 : 6

x = 27

575 - ( 6x +70 ) = 445

6x + 70 = 575 - 445

6x + 70 = 130

6x = 60

x = 10

    (6x - 39) : 3 = 21

\(\Rightarrow\) 2x - 13 = 21

\(\Rightarrow\) 2x = 34

\(\Rightarrow\) x = 17

Vậy x = 17

\(\left(6x-39\right):3=21\\ 6x-39=63\\ 6x=102\\ x=17\)

(6x-39)=5628÷28

6x-39=201

6x=240

x=40

(6x-39).28=5628

6x-39=5628:28

6x-39=201

6x=201+39

6x=240

x=40

(6x - 39) = 5628 : 28

6x - 39    = 201

6x           = 201 + 39

6x           = 240

  x           = 240 : 6

Vậy x = 40

a: \(=5y^2\left(5x+3\right)\)

b: \(=6x\left(x-y\right)+3y\left(x-y\right)\)

\(=3\left(x-y\right)\left(2x+y\right)\)

\(a,25xy^2+15y^2=5y^2\left(5x+3\right)\\ b,6x\left(x-y\right)+3xy-3y^2=6x\left(x-y\right)+3y\left(x-y\right)=\left(6x+3y\right)\left(x-y\right)=3\left(2x+y\right)\left(x-y\right)\)

a)25xy²+15y²=5y²(5x+3)

b)6x(x-y)+3xy-3y²=6x(x-y)+(3xy-3y²)=6x(x-y)+3y(x-y)=(x-y)(6x+3y)=3(x-y)(2x+y)

(6x - 39) : 3 = 201

6x - 39        = 201 . 3

6x - 39        = 603

6x              = 603 + 39

6x              = 642

x                = 642 : 6

x                = 107

(6x-39):3=201

  6x-39=603

  6x=642

    x=107

bạn Công chúa nguyễn làm thiếu bước dòi nè!!

Ghi rõ đề bài ra

( 6x - 39 ) . 28 = 56 . 28

<=>( 6x - 39 ) . 28 = 1568

<=> 6x - 39 = 56

<=> 6x = 95

<=> x = 95 : 6

<=> x = 95/6

(6x -39) .28= 56.28

=>6x -39= 56

=>6x = 56+39=95

=> 6x=95 : 6 =95/6

( 6x - 39 ) . 28 = 56 . 28

6x - 39            = 56 . 28 : 28

6x - 39            = 56

6x                   = 56 + 39

x                   = 95 : 6 

x                   = 95/6

=> (6x - 39) : 3 - 200 = 1

=> (6x - 39) : 3 = 201

=> 6x - 39 = 603

=> 6x = 642

=> x = 107

(6x-39):3=5628:28=201

6x-39=201.3=603

6x=603+39=642

x=107

Tìm gì vậy bạn

chứ nói ko làm sao giải được

     [(6x-39) :3]=5628:28

     [(6x-39) :3]=201

           (6x-39)=201x3

           (6x-39)=603

            6x     =603+39

            6x     =642

             x      =642:6

             x      =107

             x      =