1.\(\left(2x-1\right)\left(x-1\right)=0\)

2. \(\left(x+1\right)\left(2x-5\right)=0\)

3. \(\left(2x-1\right)\left(x+4\right)=0\)

4. Vô nghiệm vì VT > 0 \(\forall\)x

bạn lm chi tiết cho mink ik 

Ta có :

\(\left(2x^2-3x+1\right)-\left(2x^2-3x+4\right)=0\)

\(\Leftrightarrow2x^2-3x+1-2x^2+3x-4=0\)

\(\Leftrightarrow-3=0\left(ktm\right)\)

\(\Leftrightarrow x\in\varnothing\)

Bài 1:

a) f(x)-g(x)=2x³-x²+5+2x³-x²-1-2x

=4x³-2x²-2x-1

Bậc: 3

b) f(x)+g(x)=2x³-x²+5-2x³+x²+1+2x

=2x+6

Để f(x)+g(x)=0 thì 2x+6=0

=>2x=-6

=>x=-3

Bài 2:

a) \(\left|x+\dfrac{1}{5}\right|-\dfrac{1}{7}=0\)

\(\Rightarrow\left|x+\dfrac{1}{5}\right|=\dfrac{1}{7}\)

\(\Rightarrow\left[{}\begin{matrix}x+\dfrac{1}{5}=\dfrac{1}{7}\Rightarrow x=\dfrac{-2}{35}\\x+\dfrac{1}{5}=\dfrac{-1}{7}\Rightarrow x=\dfrac{-12}{35}\end{matrix}\right.\)

b) \(2\left(x+1\right)+4^2=2^4\)

\(\Rightarrow2x+2+16=16\)

\(\Rightarrow2x+2=0\)

\(\Rightarrow2x=-2\)

\(\Rightarrow x=-1\)

Mấy bài này căng vậy?

a)4(18 - 5x) - 12(3x - 7) = 15(2x - 16) - 6(x + 14)

<=>72 - 20x - 36x +84 = 30x - 240 - 6x 84

<=> -80x = -480

<=> x = 6

b) 5(3x+5)-4(2x-3) =5x+3(2x+12)+1

<=> 15x + 25  - 8x + 12 = 5x + 6x + 36 + 1

<=> 15x + 25 - 8x + 12 - 5x - 6x - 36 - 1 = 0

<=> -4x = 0

<=> x = 0

c) 2(5x-8)-3(4x-5)=4(3x-4)+11

= 10x - 16 - 12x + 15 = 12x - 16 + 11

= -14x = -4

= x =\(\frac{2}{7}\)

d) 5x-3{4x-2[4x-3(5x-2)]}=182

= 5x - 3 . [4x - 2(4x - 15x + 6)]

= 5x - 3 . (4x - 8x + 30x - 12)

= 5x - 12x + 24x - 90x + 36

= -73x + 36 = 182

=> -73x = 182 - 36 = 146

=> x = 146 : (-73) = -2

~Hok tốt~

a)4(18 - 5x) - 12(3x - 7) = 15(2x - 16) - 6(x + 14)

<=>72 - 20x - 36x +84 = 30x - 240 - 6x 84

<=> -80x = -480

<=> x = 6

b) 5(3x+5)-4(2x-3) =5x+3(2x+12)+1

<=> 15x + 25  - 8x + 12 = 5x + 6x + 36 + 1

<=> 15x + 25 - 8x + 12 - 5x - 6x - 36 - 1 = 0

<=> -4x = 0

<=> x = 0

c) 2(5x-8)-3(4x-5)=4(3x-4)+11

= 10x - 16 - 12x + 15 = 12x - 16 + 11

= -14x = -4

= x = 2/7

d) 5x-3{4x-2[4x-3(5x-2)]}=182

= 5x - 3 . [4x - 2(4x - 15x + 6)]

= 5x - 3 . (4x - 8x + 30x - 12)

= 5x - 12x + 24x - 90x + 36

= -73x + 36 = 182

=> -73x = 182 - 36 = 146

=> x = 146 : (-73) = -2

a) \(\left|x-2\right|+3x-9=0\)

\(\Leftrightarrow\left|x-2\right|=9-3x\)

+) Xét \(x\ge2\)

\(pt\Leftrightarrow x-2=9-3x\)

\(\Leftrightarrow x+3x=9+2\)

\(\Leftrightarrow4x=11\)

\(\Leftrightarrow x=\frac{11}{4}\left(tm\right)\)

+) Xét \(x< 2\)

\(pt\Leftrightarrow2-x=9-3x\)

\(\Leftrightarrow-x+3x=9-2\)

\(\Leftrightarrow2x=7\)

\(\Leftrightarrow x=\frac{7}{2}\left(ktm\right)\)

Vậy....

a) (2x + 1)(x - 1) = 0

<=> 2x + 1 = 0 hoặc x - 1 = 0

<=> x = -1/2 hoặc x = 1

b) (x + 2/3)(x - 1/2) = 0

<=> x + 2/3 = 0 hoặc x - 1/2 = 0

<=> x = -2/3 hoặc x = 1/2

c) (3x - 1)(2x - 3)(x + 5) = 0

<=> 3x - 1 = 0 hoặc 2x - 3 = 0 hoặc x + 5 = 0

<=> x = 1/3 hoặc x = 3/2 hoặc x = -5

d) 3x - 15 = 2x(x - 5)

<=> 3x - 15 = 2x² - 10x

<=> 3x - 15 - 2x² + 10x = 0

<=> 13x - 15 - 2x² = 0

<=> 2x² - 13x + 15 = 0

<=> 2x² - 3x - 10x + 15 = 0

<=> x(2x - 3) - 5(2x - 3) = 0

<=> (x - 5)(2x - 3) = 0

<=> x - 5 = 0 hoặc 2x - 3 = 0

<=> x = 0 hoặc x = 3/2

e) x² - x = 0

<=> x(x - 1) = 0

<=> x = 0 hoặc x - 1 = 0

<=> x = 0 hoặc x = 1

f) x² - 2x = 0

<=> x(x - 2) = 0

<=> x = 0 hoặc x - 2 = 0

<=> x = 0 hoặc x = 2

g) x² - 3x = 0

<=> x(x - 3) = 0

<=> x = 0 hoặc x - 3 = 0

<=> x = 0 hoặc x = 3

h) (x + 1)(x + 2) = (2 - x)(x + 3)

<=> x² + 2x + x + 2 = 2x + 6 - x² - 3x

<=> x² + 3x + 2 = -x + 6 - x²

<=> x² + 3x + 2 + x - 6 + x² = 0

<=> 2x² + 4x - 4 = 0

làm nốt đi :))

nỡ giúp rùi thì bn giúp mink nốt ik vì mink ngu toán cực kì luôn

a: =>2x^2-2x+2x-2-2x^2-x-4x-2=0

=>-5x-4=0

=>x=-4/5

b: =>6x^2-9x+2x-3-6x^2-12x=16

=>-19x=19

=>x=-1

c: =>48x^2-12x-20x+5+3x-48x^2-7+112x=81

=>83x=83

=>x=1