a) 17x + 3.(-16x - 7) = 2x + 43 - 4x

    17x + (-48x) - 21 = 2x - 4x  + 43 

     -31x - 21 = -2x + 43

     -31x - 2x = 21 + 43

      -33x = 64

         x = 64 : -33

         x = .....

b) 103 - 57 : [-2.(2x.1)² - 9⁰ ) = -106

     57 : [-8.x_² - 1) = -103 - 106

     57 : [-8.x_² - 1) = -209

     -8.x_²  = -209.57 + 1

     -8.x_²  = -11912

       x² = -11912 : 8

      x² = -1498 ( K thỏa mãn)

Nên x thuộc Tập Hợp Rỗng

a)64/33

b) x rỗng

xong

-2x-3.(x-17)=34-2.(-x+25)

-2x - 3x -51= 34 - 2x + 50

-2x -3x +2x= 50 + 51

-3x = 101

x = -101/3

hok tốt!

\(-2x-3\left(x-17\right)=34-2\left(-x+25\right)\)

\(\Leftrightarrow-2x-3\left(x-17\right)=34-2\left(25-x\right)\)

\(\Leftrightarrow-2x-3x+51=34-50+2x\)

\(\Leftrightarrow-5x+51=34-50+2x\)

\(\Leftrightarrow-5x+51=2x-16\)

\(\Leftrightarrow51=2x-16+5x\)

\(\Leftrightarrow51=7x-16\)

\(\Leftrightarrow51+16=7x\)

\(\Leftrightarrow67=7x\)

\(\Leftrightarrow x=67:7\)

\(\Leftrightarrow x=\frac{67}{7}\)

Vậy \(x=\frac{67}{7}\)

\(17x-\left(-16x-37\right)=2x\)\(+43\)

\(\Rightarrow17x+16x+37=2x+43\)

\(\Rightarrow17x+16x-2x=43-37\)

\(\Rightarrow31x=6\)

\(\Rightarrow x=\frac{6}{31}\)

17x - ( - 16x - 37 ) = 2x + 43

=> 17x + 16x + 37  = 2x + 43

=> 33x - 2x =  43 - 37 

=> 31x = 6 

=> \(x=\frac{6}{31}\)

!!! K chắc

Ta có : M = 3 - 3² + 3³ - 3⁴ + .... + 3²⁰¹⁷ - 3²⁰¹⁸ + 3²⁰¹⁹

=> 3M = 3² - 3³ + 3⁴ - 3⁵ + .... + 3²⁰¹⁸ - 3²⁰¹⁹ + 3²⁰²⁰

Lấy 3M cộng M ta có : 

3M + M = (3 - 3² + 3³ - 3⁴ + .... + 3²⁰¹⁷ - 3²⁰¹⁸ + 3²⁰¹⁹) + (3² - 3³ + 3⁴ - 3⁵ + .... + 3²⁰¹⁸ - 3²⁰¹⁹ + 3²⁰²⁰)

4M = 3 + 3²⁰²⁰ 

Lại có 2x + 15 + 3²⁰²⁰ = 4M

<=> 2x + 15 + 3²⁰²⁰ = 3 + 3²⁰²⁰

=> 2x = - 12

=> x = - 6

Vậy x = - 6

-63+415-37-115

=(-63-37)+(415-115)

=-100+300

=200

nhớ k cho mình nha

học tốt

\(-63+415-37-115\)

\(=352-57-115\)

\(=315-115\)

\(=200\)

\(13.\left(-2\right)^2+37.4+4.\left(-15\right)\)

\(=13.2^2+37.4+4.-150\)

\(=13.4+37.4+4.-150\)

\(=4.\left(13+37+-150\right)\)

\(=4.-100\)

\(=-400\)

Trả lời:

(-3)x - 4 = 2.(-7) + 4

(-3)x - 4 = -14 + 4

(-3)x - 4 = -10

(-3)x      = -6

x           = 2

Vậy x = 2

Hok tốt!

Vuong Dong Yet

(-3). x - 4 = 2 . (-7) + 4

=> (-3) . x -4 = -10

=>-3x            = -10 + 4

=> -3x           = -6

=>    x           = -6 : (-3)

=>  x             = 2

Vậy x = 10

- 12 . x + 34 = 10

=> - 12 x = - 24

=> x = 2

Vậy x= 2

-12x=-24

X=2

Trả lời:

(-12)x + 34 = 10

(-12)x         = -24

x                = 2

Vậy x = 2

Hok tốt!

Vuong Dong Yet

Tìm x:

(-12). x+34=10

             -12x=10-34

            -12x=-24

                 x=-24:(-12)

                 x=2

Đg 100%

\(125-\left(-75\right)+32-\left(48+32\right)\)

\(=125-\left(-75\right)+32-80\)

\(=125+75+32-80\)

\(=200+32-80\)

\(=232-80\)

\(=152\)

\(-63+415-37-115\)

\(=352-57-115\)

\(=315-115\)

\(=200\)

\(13.\left(-2\right)^2+37.4+4.\left(-150\right)\)

\(=13.2^2+37.4+4.-150\)

\(=13.4+37.4+4.-150\)

\(=4.\left(13+37+-150\right)\)

\(=4.-100\)

\(=-400\)

\(-15.x+4=79\)

\(\Leftrightarrow-15.x=79-4\)

\(\Leftrightarrow-15.x=75\)

\(\Leftrightarrow x=75:-15\)

\(\Leftrightarrow x=-5\)

Vậy \(x=-5\)

\(15-\left(2+x\right)=23\)

\(\Leftrightarrow2+x=15-23\)

\(\Leftrightarrow2+x=-8\)

\(\Leftrightarrow x=-8-2\)

\(\Leftrightarrow x=-10\)
Vậy \(x=-10\)

\(\left(x+2\right)\left(x^2-1\right)=0\)

\(\Leftrightarrow\left(x+2\right)\left(x^2-1^2\right)=0\)

\(\Leftrightarrow\left(x+2\right)\left(x+1\right)\left(x-1\right)=0\)

\(\Leftrightarrow\left(x+1\right)\left(x-1\right)=0\)

\(\Leftrightarrow x=\pm1\)

Vậy \(x\in\left\{\pm1\right\}\)

\(56:\left|x-4\right|=7\)

\(\Leftrightarrow\left|x-4\right|=56:7\)

\(\Leftrightarrow\left|x-4\right|=8\)

\(\Leftrightarrow\orbr{\begin{cases}x-4=8\\x-4=-8\end{cases}\Leftrightarrow\orbr{\begin{cases}x=8+4\\x=-8+4\end{cases}\Leftrightarrow}\orbr{\begin{cases}x=12\\x=-4\end{cases}}}\)

Vậy \(x\in\left\{12;-4\right\}\)