\(\dfrac{1}{2}\))^2=0

b) (x-2)^2=1

c)(2x-1)3=-8

d)(x+

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a: =>13/6x=-1/2

=>x=-1/2:13/6=-1/2x6/13=-6/26=-3/13

b: =>2x-1=1/2 hoặc 2x-1=-1/2

=>2x=3/2 hoặc 2x=1/2

=>x=3/4 hoặc x=1/4

c: =>(x-4)(x+4)(4-5x)=0

hay \(x\in\left\{4;-4;\dfrac{4}{5}\right\}\)

13 tháng 8 2017

Bài 1:

a) \(x^2-3=1\)

\(\Rightarrow x^2=1+3=4\)

\(\Rightarrow x=\pm2\)

b)\(2x^3+12=-4\)

\(\Rightarrow2x^3=-4-12=-16\)

\(\Rightarrow x^3=-8\)

\(\Rightarrow x=-2\)

c)\(\left(2x-3\right)^2=16\)

\(\Leftrightarrow\left[{}\begin{matrix}2x-3=4\\2x-3=-4\end{matrix}\right.\Leftrightarrow}\left[{}\begin{matrix}x=\dfrac{7}{2}\\-\dfrac{1}{2}\end{matrix}\right.\)

13 tháng 8 2017

a) \(x^2-3=1\Rightarrow x^2=4\Rightarrow x=\pm2\)

b) \(2x^3+12=-4\Rightarrow2x^3=-16\)

\(\Rightarrow x^3=-\dfrac{16}{2}=-8=-2^3\)

\(\Rightarrow x=-2\)

c) \(\left(2x-3\right)^2=16\)

\(\Rightarrow\left[{}\begin{matrix}2x-3=4\\2x-3=-4\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=\dfrac{7}{2}\\x=-\dfrac{1}{2}\end{matrix}\right.\)

d,h,i,k cững tương tự....

27 tháng 11 2022

b: =>(3x-1)(3x+1)(2x+3)=0

hay \(x\in\left\{\dfrac{1}{3};-\dfrac{1}{3};-\dfrac{3}{2}\right\}\)

c: \(\Leftrightarrow\left|2x-\dfrac{1}{3}\right|=\dfrac{5}{6}+\dfrac{3}{4}=\dfrac{19}{12}\)

=>2x-1/3=19/12 hoặc 2x-1/3=-19/12

=>2x=23/12 hoặc 2x=-15/12=-5/4

=>x=23/24 hoặc x=-5/8

d: \(\Leftrightarrow-\dfrac{5}{6}\cdot x+\dfrac{3}{4}=-\dfrac{3}{4}\)

=>-5/6x=-3/2

=>x=3/2:5/6=3/2*6/5=18/10=9/5

e: =>2/5x-1/2=3/4 hoặc 2/5x-1/2=-3/4

=>2/5x=5/4 hoặc 2/5x=-1/4

=>x=5/4:2/5=25/8 hoặc x=-1/4:2/5=-1/4*5/2=-5/8

f: =>14x-21=9x+6

=>5x=27

=>x=27/5

h: =>(2/3)^2x+1=(2/3)^27

=>2x+1=27

=>x=13

i: =>5^3x*(2+5^2)=3375

=>5^3x=125

=>3x=3

=>x=1

20 tháng 8 2017

a) \(\left(x-\dfrac{1}{2}\right)^2=0\Leftrightarrow x-\dfrac{1}{2}=0\Leftrightarrow x=\dfrac{1}{2}\) vậy \(x=\dfrac{1}{2}\)

b) \(\left(x-2\right)^2=1\Leftrightarrow\left[{}\begin{matrix}x-2=\sqrt{1}\\x-2=-\sqrt{1}\end{matrix}\right.\) \(\Leftrightarrow\left[{}\begin{matrix}x-2=1\\x-2=-1\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=3\\x=1\end{matrix}\right.\)

vậy \(x=3;x=1\)

c) \(\left(2x-1\right)^3=-8\Leftrightarrow2x-1=\sqrt[3]{-8}=-2\Leftrightarrow2x=-1\)

\(\Leftrightarrow x=\dfrac{-1}{2}\) \(\) vậy \(x=\dfrac{-1}{2}\)

d) \(\left(x+\dfrac{1}{2}\right)^2=\dfrac{1}{16}\Leftrightarrow\left[{}\begin{matrix}x+\dfrac{1}{2}=\sqrt{\dfrac{1}{16}}\\x+\dfrac{1}{2}=-\sqrt{\dfrac{1}{16}}\end{matrix}\right.\) \(\Leftrightarrow\left[{}\begin{matrix}x+\dfrac{1}{2}=\dfrac{1}{4}\\x+\dfrac{1}{2}=-\dfrac{1}{4}\end{matrix}\right.\)

\(\Leftrightarrow\left[{}\begin{matrix}x=\dfrac{-1}{4}\\x=\dfrac{-3}{4}\end{matrix}\right.\) vậy \(x=\dfrac{-1}{4};x=\dfrac{-3}{4}\)

a: \(\left|x\right|=3+\dfrac{1}{5}=\dfrac{16}{5}\)

mà x<0

nên x=-16/5

b: \(\left|x\right|=-2.1\)

nên \(x\in\varnothing\)

c: \(\left|x-3.5\right|=5\)

=>x-3,5=5 hoặc x-3,5=-5

=>x=8,5 hoặc x=-1,5

d: \(\left|x+\dfrac{3}{4}\right|-\dfrac{1}{2}=0\)

=>|x+3/4|=1/2

=>x+3/4=1/2 hoặc x+3/4=-1/2

=>x=-1/4 hoặc x=-5/4

a: Đặt A=0

=>-2/3x=5/9

hay x=-5/6

b: Đặt B(x)=0

=>(x-2/5)(x+2/5)=0

=>x=2/5 hoặc x=-2/5

c: Đặt C(X)=0

\(\Leftrightarrow x^3\cdot\dfrac{1}{2}=-\dfrac{4}{27}\)

\(\Leftrightarrow x^3=-\dfrac{8}{27}\)

hay x=-2/3

10 tháng 6 2017

a) \(\left(x-\dfrac{1}{2}\right)^2=0\Rightarrow x-\dfrac{1}{2}=0\Rightarrow x=\dfrac{1}{2}\)

b) Vì \(\left(x-2\right)^2=1\Rightarrow\left\{{}\begin{matrix}x-2=2\\x-2=-2\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}x=4\\x=0\end{matrix}\right.\)

Vậy x = 4 hoặc x = 0

c) Vì \(\left(2.x-1\right)^3=-8\Rightarrow2.x-1=-2\Rightarrow2.x=-1\Rightarrow x=-\dfrac{1}{2}\)

d) Vì \(\left(x+\dfrac{1}{2}\right)^2=\dfrac{1}{16}\Rightarrow\left\{{}\begin{matrix}x+\dfrac{1}{2}=\dfrac{1}{4}\\x+\dfrac{1}{2}=-\dfrac{1}{4}\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}x=-\dfrac{1}{4}\\x=-\dfrac{3}{4}\end{matrix}\right.\)

23 tháng 6 2017

a) \(\left(x-\dfrac{1}{2}\right)^2=0\Leftrightarrow x-\dfrac{1}{2}=0\Leftrightarrow x=\dfrac{1}{2}\)

b) \(\left(x-2\right)^2=1\Leftrightarrow\left\{{}\begin{matrix}x-2=1\\x-2=-1\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=3\\x=1\end{matrix}\right.\)

c) \(\left(2x-1\right)^3=-8\Leftrightarrow2x-1=-2\Leftrightarrow2x=-1\Leftrightarrow x=\dfrac{-1}{2}\) d) \(\left(x+\dfrac{1}{2}\right)^2=\dfrac{1}{16}\Leftrightarrow x+\dfrac{1}{2}=\dfrac{1}{4}\Leftrightarrow x=\dfrac{-1}{4}\)

25 tháng 7 2017

a, \(\left(x-\dfrac{1}{3}\right)^2=0\)

=> \(x-\dfrac{1}{3}=0\)

=>\(x=\dfrac{1}{3}\)

Vậy \(x=\dfrac{1}{3}\)

b, \(\left(x+\dfrac{1}{2}\right)^2=\dfrac{1}{16}\)

=>\(\left(x+\dfrac{1}{2}\right)^2=\left(\dfrac{1}{8}\right)^2\)

=> \(x+\dfrac{1}{2}=\dfrac{1}{8}\)

=> \(x=-\dfrac{3}{8}\)

c, (2x - 1)^3 = 8

=> (2x - 1)^3 = 2^3

=> 2x - 1 = 2

=> 2x = 3

=> x = 3/2

25 tháng 7 2017

a) (x - \(\dfrac{1}{3}\))2=0

=> x- \(\dfrac{1}{3}\)=0

x=\(\dfrac{1}{3}\)

b) (x + \(\dfrac{1}{2}\))2=\(\dfrac{1}{16}\)

=> (x+\(\dfrac{1}{2}\)) 2= (\(\dfrac{1}{4}\))2=(\(\dfrac{-1}{4}\))2

TH1: x+ \(\dfrac{1}{2}\)=\(\dfrac{1}{4}\)

x= \(\dfrac{-1}{4}\)

TH2 : x + \(\dfrac{1}{2}\)= \(\dfrac{-1}{4}\)

x = \(\dfrac{-3}{4}\)

Vậy x = \(\dfrac{-1}{4}\); \(\dfrac{-3}{4}\)

c) (2x-1)3 =8

=> 2x - 1 = 2

2x = 3

x = \(\dfrac{3}{2}\)

24 tháng 8 2018

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

\(\dfrac{2}{3}-\dfrac{1}{3}x-\dfrac{1}{2}-x+\dfrac{1}{2}=5\)

\(\dfrac{2}{3}-\dfrac{1}{2}+\dfrac{1}{2}-\dfrac{1}{3}x-x=5\)

\(\dfrac{2}{3}-\dfrac{1}{3}x-x=5\)

\(\dfrac{2}{3}-\dfrac{4}{3}x=5\)

\(\dfrac{4}{3}x=\dfrac{2}{3}-5\)

\(\dfrac{4}{3}x=-\dfrac{13}{3}\)

\(x=-\dfrac{13}{3}:\dfrac{4}{3}\)

\(x=-\dfrac{13}{4}\)

Vậy...............

\(b,\left(x+\dfrac{1}{2}\right)\left(\dfrac{3}{4}-x\right)=0\)

\(\Rightarrow\left\{{}\begin{matrix}x+\dfrac{1}{2}=0\\\dfrac{3}{4}-x=0\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}x=-\dfrac{1}{2}\\x=\dfrac{3}{4}\end{matrix}\right.\)

Vậy................

\(c,\dfrac{2x-1}{-3+2}=0\)

\(\Rightarrow2x-1=0\)

\(\Rightarrow x=\dfrac{1}{2}\)

Vậy.............