a, \(-4x+5+2x-1=3\Leftrightarrow-2x=-1\Leftrightarrow x=\dfrac{1}{2}\)

b, \(-2x+2=2\Leftrightarrow x=0\)

c, \(-2x-6=-8\Leftrightarrow x=1\)

`a) (x^2 - 4x  +5 ) - (x^2 - 2x + 1)=3`

`=> x^2 - 4x + 5 - x^2 + 2x - 1 = 3`

`=> (x^2 - x^2) - (4x - 2x) + (5-1) = 3`

`=> -2x + 4 =3`

`=> -2x = 3-4`

`=> -2x = -1`

`=>x = -1 : -2`

`=> x = 1/2`

Vậy `x=1/2`

`5x(x-3)=(x-2)(5x-1)-5`

`\rightarrow 5x^2-15x= [x(5x-1)-2(5x-1)-5]`

`\rightarrow 5x^2-15x=(5x^2-x-10x+2-5)`

`\rightarrow 5x^2-15x=5x^2-11x-3`

`\rightarrow 5x^2-15x-5x^2+11x+3=0`

`\rightarrow -4x+3=0`

`\rightarrow 4x=3`

`\rightarrow x=`\(\dfrac{3}{4}\)

Vậy, `x=`\(\dfrac{3}{4}\)

Còn biến `y` thì mình k thấy bạn nhé!

Cho mk sửa lại từ dòng thứ 6 (tính cả đề)

`\rightarrow -4x+3=0`

`\rightarrow -4x=-3`

`\rightarrow x=-3/-4`

`\rightarrow x=3/4`

Vậy, `x=3/4`

\(\dfrac{6x+5}{5x-3}=\dfrac{38-6x}{21-5x}\left(đk:x\ne\dfrac{5}{3},x\ne\dfrac{21}{5}\right)\)

\(\Rightarrow\left(6x+5\right)\left(21-5x\right)=\left(5x-3\right)\left(38-6x\right)\)

\(\Rightarrow-30x^2+101x+105=-30x^2+208x-114\)

\(\Rightarrow107x=219\Rightarrow x=\dfrac{219}{107}\left(tm\right)\)

\(\dfrac{6x+5}{5x-3}=\dfrac{6x-38}{5x-21}\)

\(\Leftrightarrow30x^2-126x+25x-105=30x^2-18x-190x+114\)

\(\Leftrightarrow-101x-105=-208x+114\)

\(\Leftrightarrow107x=219\)

hay \(x=\dfrac{219}{107}\)

a)

<=> 10x - 35 + 16x - 10 = 5 

<=> 10x + 16x = 5 + 35 + 10

<=> 26x = 50

<=> x = 50/26 = 25/13

\(\Leftrightarrow5x^2-20x+3x-12-x^2+5x=4x^2-25\)

\(\Leftrightarrow-18x=-13\)

hay x=13/18

x=2

không có kết quả làm sao làm dược

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

    5x(x - 1) - (x - 1) = 0

    (x - 1) (5x - 1) = 0

TH1: x - 1 = 0

        x       = 1

TH2: 5x - 1 = 0

         5x      = 1

          x       = 1/5

Vay x = 1 hoac x = 1/5.

b) 2(x + 5) - x² - 5x = 0

    2(x + 5) - x(x + 5) = 0

    (x + 5) (2 - x) = 0

TH1: x + 5 = 0

        x        = -5

TH2: 2 - x = 0

              x  = 2

Vay x = -5 hoac x = 2

a, x = 1

b , x = -5 hoặc x = 2