tim x biet x^2+3x+1=0
tim x biet x^3-3x^2+3x-1=0
x^3 - 3x^2 + 3x - 1 = 0
( x- 1)^3 = 0
=> x -1 = 0
=> x = 1
tim x biet -3x/4.(1/x+2/7)=0
TIM X BIET:
A/ (X-3).(X-1/2)=0
B/ X2-2X=0
C/(3X-1).(X2+1)=0
D/ (X-2).(X+1)=0
\(a)\)\(\left(x-3\right)\left(x-\frac{1}{2}\right)=0\)
\(\Leftrightarrow\)\(\orbr{\begin{cases}x-3=0\\x-\frac{1}{2}=0\end{cases}\Leftrightarrow\orbr{\begin{cases}x=3\\x=\frac{1}{2}\end{cases}}}\)
Vậy \(x=3\) hoặc \(x=\frac{1}{2}\)
\(b)\) \(x^2-2x=0\)
\(\Leftrightarrow\)\(x\left(x-2\right)=0\)
\(\Leftrightarrow\)\(\orbr{\begin{cases}x=0\\x-2=0\end{cases}\Leftrightarrow\orbr{\begin{cases}x=0\\x=2\end{cases}}}\)
Vậy \(x=0\) hoặc \(x=2\)
\(c)\) \(\left(3x-1\right)\left(x^2+1\right)=0\)
\(\Leftrightarrow\)\(\orbr{\begin{cases}3x-1=0\\x^2+1=0\end{cases}\Leftrightarrow\orbr{\begin{cases}3x=1\\x^2=-1\end{cases}\Leftrightarrow}\orbr{\begin{cases}x=\frac{1}{3}\\x\in\left\{\varnothing\right\}\end{cases}}}\)
Vậy \(x=\frac{1}{3}\)
\(d)\) \(\left(x-2\right)\left(x+1\right)=0\)
\(\Leftrightarrow\)\(\orbr{\begin{cases}x-2=0\\x+1=0\end{cases}}\Leftrightarrow\orbr{\begin{cases}x=2\\x=-1\end{cases}}\)
Vậy \(x=-1\) hoặc \(x=2\)
Chúc bạn học tốt ~
Tim x biet
a) 3x+5-2(x+4)=4x+1/2b)(x+1)(x-1) <0c)(x-2)(x+2/3) >0tim x biet:
( x^2-4x+16 )( x+4 )-x ( x+1 )(x+2)+3x^2=0
(8x+2)(1-3x)+(6x-1)(4x-10)=-50
( x2 - 4x + 16 )( x + 4 ) - x( x + 1 )( x + 2 ) + 3x2 = 0
<=> x3 + 43 - x( x2 + 3x + 2 ) + 3x2 = 0
<=> x3 + 64 - x3 - 3x2 - 2x + 3x2 = 0
<=> 64 - 2x = 0
<=> 2x = 64
<=> x = 32
( 8x + 2 )( 1 - 3x ) + ( 6x - 1 )( 4x - 10 ) = -50
<=> 2x - 24x2 + 2 + 24x2 - 64x + 10 = -50
<=> -62x + 12 = -50
<=> -62x = -62
<=> x = 1
Tim x biet
(X+1)×(x+2)<0 x-2/3x+2 <0
(-3+3/x -1/3) ÷ (1+2/3+2/5)=-5/4
Tim x nguyen , biet : |3x-2| -|x+1| = 0
Giup mk nhe !!!!
|3x - 2| - |x + 1| = 0
=> |3x - 2| = |x + 1|
=> 3x - 2 = x + 1 hoặc 3x - 2 = -(x + 1)
Em biết giải 2 trường hợp đó không ? Chị đang bận nên chỉ giúp được đến đấy thôi, xin lỗi em !
Bài giải
\(\left|3x-2\right|-\left|x+1\right|=0\)
\(\left|3x-2\right|=\left|x+1\right|\)
* Với \(3x-2< 0\) => \(3x< 2\) => \(x< \frac{2}{3}\) thì :
\(3x-2=-x-1\)
\(3x+x=-1+2\)
\(4x=1\)
\(x=\frac{1}{4}\) ( Thỏa mãn )
* Với \(3x-2\ge0\) => \(3x\ge2\) => \(x\ge\frac{2}{3}\) thì :
\(3x-2=x+1\)
\(3x-x=1+2\)
\(2x=3\)
\(x=\frac{3}{2}\) ( Thỏa mãn )
\(\Rightarrow\text{ }x\in\left\{\frac{1}{4}\text{ ; }\frac{3}{2}\right\}\)
Tim x biet rang:
a) 4/4^x + 3.4^2-x = 832
b) (3x - 2)^2002 = (3x - 2)^2004
c) /1 - 2x/ + x + 2 = 0
TIM X , BIET ; 3x(x-2)-x+2=0 Lam nhanh ho minh nghe
\(3x\left(x-2\right)-x+2=0\)
\(\Leftrightarrow3x\left(x-2\right)-\left(x-2\right)=0\)
\(\Leftrightarrow\left(x-2\right)\left(3x-1\right)=0\)
\(\Leftrightarrow\orbr{\begin{cases}x-2=0\\3x-1=0\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}x=2\\x=\frac{1}{3}\end{cases}}\)