1)  10 - 3 ( x - 1 ) = -5

      3 ( x - 1 ) = 10 - ( - 5 )

      3 ( x - 1 ) =  15

          x - 1   = 15 : 3

          x - 1   = 5

         x         = 5 + 1

        x         = 6

2) 3x + 75 = - 15

    3x        = - 15 - 75

    3x        = - 90

      x       = -90 : 3

     x        = -30

4)  12 - ( x - 7 ) = - 8

             x - 7   = 12 - (- 8 )

             x - 7   = 20

             x        = 20 + 7

            x         = 27

5)  x + 75 = 15

    x         = 15 - 75

    x         = -60

7)  2x + 18 = 10

     2x        = 10 - 18

     2x        = -8

       x        = - 8 : 2

       x       = -4

8)  26 - 3x = 5

            3x = 26 - 5

            3x = 21

              x  = 21: 3

              x = 7

9) x - 12 = - 15

    x       = -15 + 12

   x         =-3

 10 ) 24 - 2 ( x + 5 ) = 38

              2 ( x+ 5 )  = 24 - 38

              2 ( x + 5 ) = - 14

                  x + 5    = -14 : 2

                  x + 5    = -7

                  x          = -7 - 5

                  x          = -12

còn là bạn tự làm tiếp nhé ! bạn gửi nhiều cầu qua bạn chỉ nên gửi ít một thời như vậy khó có thể giải làm bạn ạ!

25 - 5 (3- x) = 15 

25 - 5 (3-x) = 15  

      5 (3-x) = 25 -15 

      5 (3-x) = 10 

     3 - x = 10 : 5 

    3 - x = 2 

         x = 3 - 2 

          x = 1

a) 3(1-4x) (x-1) +4(3x-2) (x+3)=-27
b) 5(2x+3) (x+2)-2(5x-4) (x-1)=75

a) 4x(x - 5) - (x - 1)(4x - 3) = 5

4x² - 20x - (4x² - 3x - 4x + 3) = 5

4x² - 20x - 4x² + 3x + 4x - 3 = 5

-13x - 3 = 5

\(\Rightarrow\) -13x = 8

\(\Rightarrow\) x = \(\dfrac{-8}{13}\)

b) (3x - 4)(x - 2) = 3x(x - 9) - 3

3x² - 6x - 4x + 8 = 3x² - 27x - 3

3x² - 10x + 8 - 3x² + 27x + 3 = 0

17x + 11 = 0

\(\Rightarrow\) 17x = -11

\(\Rightarrow\) x = \(\dfrac{-11}{17}\)

c) x² - 81 = 0

\(\Rightarrow\) x² = 81

\(\Rightarrow\) x = \(\pm\) 9

d) 3x² - 75 = 0

3(x² - 25) = 0

\(\Rightarrow\) x² - 25 = 0

\(\Rightarrow\) x² = 25

\(\Rightarrow\) x = \(\pm\)5

e) x² - 4x + 3 = 0

x² - x - 3x + 3 = 0

(x² - x) - (3x - 3) = 0

x(x - 1) - 3(x - 1) = 0

(x - 3)(x - 1) = 0

\(\Leftrightarrow\left\{{}\begin{matrix}x-3=0\\x-1=0\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}x=3\\x=1\end{matrix}\right.\)

xin lỗi vì chữa đề

a: \(\Leftrightarrow x^2+5x+6-\left(x^2+3x-10\right)=6\)

\(\Leftrightarrow x^2+5x+6-x^2-3x+10=6\)

=>2x+16=6

=>2x=-10

hay x=-5

b: \(\Leftrightarrow3\left(x-1-4x^2+4x\right)+4\left(3x^2+9x-2x-6\right)=-27\)

\(\Leftrightarrow3\left(-4x^2+5x-1\right)+4\left(3x^2+7x-6\right)=-27\)

\(\Leftrightarrow-12x^2+15x-3+12x^2+28x-24=-27\)

=>43x=0

hay x=0

c: \(\Leftrightarrow5\left(2y^2+4y+3y+6\right)-2\left(5y^2-5y-4y+4\right)=75\)

\(\Leftrightarrow10y^2+35y+30-10y^2+18y-8=75\)

=>53y=53

hay y=1

d: \(\Leftrightarrow6x^2+27x+4x+18-\left(6x^2+x+12x+2\right)=x+1-x+6=7\)

\(\Leftrightarrow6x^2+31x+18-6x^2-13x-2=7\)

=>18x+16=7

=>18x=-9

hay x=-1/2

a) Ta có: \(-3\dfrac{1}{4}\cdot x-75\%+\dfrac{3x}{2}=-1.2:\dfrac{-9}{10}-1\dfrac{1}{4}\)

\(\Leftrightarrow\dfrac{-13x}{4}-\dfrac{3}{4}+\dfrac{3x}{2}=\dfrac{-6}{5}\cdot\dfrac{10}{-9}-\dfrac{5}{4}\)

\(\Leftrightarrow\dfrac{-13x-3+6x}{4}=\dfrac{4}{3}-\dfrac{5}{4}\)

\(\Leftrightarrow\dfrac{-7x-3}{4}=\dfrac{1}{12}\)

\(\Leftrightarrow-7x-3=\dfrac{1}{3}\)

\(\Leftrightarrow-7x=\dfrac{10}{3}\)

hay \(x=-\dfrac{10}{21}\)

b) Ta có: \(\dfrac{5}{3}+\dfrac{5}{15}+\dfrac{5}{35}+...+\dfrac{5}{x\left(x+2\right)}=2\dfrac{8}{17}\)

\(\Leftrightarrow\dfrac{5}{2}\left(\dfrac{2}{3}+\dfrac{2}{15}+\dfrac{2}{35}+...+\dfrac{2}{x\left(x+2\right)}\right)=2\dfrac{8}{17}\)

\(\Leftrightarrow\dfrac{5}{2}\left(1-\dfrac{1}{3}+\dfrac{1}{3}-\dfrac{1}{5}+...+\dfrac{1}{x}-\dfrac{1}{x+2}\right)=2+\dfrac{8}{17}\)

\(\Leftrightarrow\left(1-\dfrac{1}{x+2}\right)=\dfrac{42}{17}:\dfrac{5}{2}\)

\(\Leftrightarrow\dfrac{x+1}{x+2}=\dfrac{42}{17}\cdot\dfrac{2}{5}=\dfrac{84}{85}\)

\(\Leftrightarrow85x+85=84x+168\)

\(\Leftrightarrow x=83\)

dẫu . là dấu nhân nha mn.

mong mn giải giúp mình mình đang cần gấp

a , 3x + 11 = 71

     3x        = 71 - 11

     3x        = 60

       x       = 60 : 3

       x       = 20

b , 75 - 5x = 15

           5x = 75 - 15

           5x = 60

             x = 60 : 5

             x = 12

c , 3( x + 2 ) - 1 = 20

     3( x + 2 )     = 20 + 1

     3( x + 2 )     = 21

          x + 2      = 21 : 3

          x + 2      = 7

          x            = 7 - 2

          x           = 5

a) 3x+11=71

         3x=71-11

         3x=60

           x=60:3

           x=20

b) 75-5x=15

        5x=75-15

        5x=60

          x=60:5

          x=12

c) 3(x+2)-1=20

      3(x+2)=20+1

      3(x+2)=21

         x+2=21:3

         x+2=7

             x=7-2

             x=5

a) 3x + 11= 71

=> 3x = 71 - 11 = 60

=> x = 60 : 3 = 20

Vậy x = 20

b) 75 - 5x = 15

=> 5x = 75 - 15 = 60

=> x = 60 : 5 = 12

Vậy x = 12

c) 3(x+2) - 1 = 20

=> 3(x+2) = 20 + 1 =21

=> x + 2 = 21 : 3 = 7

=> x = 7 - 2 = 5

Vậy x = 5

25 x ( x - 2 ) - 5=45

25 x ( x - 2 ) = 45 + 5 

25 x ( x - 2 ) = 50 

x - 2 = 50 : 25 

x - 2 = 2 

x = 2 + 2 

x = 4 

30 - 2 x ( x - 1 )=4

2 x ( x - 1 ) =  30 - 4 

2 x ( x - 1 ) =  26 

x - 1 = 26 : 2 

x - 1 = 13 

x = 12 

3 x (x - 2)-4=17

3 x ( x - 2 ) = 17 + 4 

3 x ( x - 2 ) = 21 

x - 2 = 21 : 3 

x - 2 = 7 

x = 7 + 2 

x = 9 

75 - 2 x ( x - 1 )= 13

2 x ( x - 1 ) = 75 - 13 

2 x ( x - 1 ) = 62 

x - 1 = 62 : 2 

x - 1 = 31 

x = 31 + 1 

x = 32 

nha bạn 

\(25.\left(x-2\right)-5=45\)

\(25.\left(x-2\right)=50\)

\(x-2=2\)

\(x=4\)