Help me ! 8 ( x - 3 ) = 0
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* 4x : 17 = 0
4x = 0
x = 0 : 4 = 0
* 7x - 8 = 713
7x = 713 + 8
7x = 721
x = 721 : 7 = 103
* 8(x - 3) = 0
8x - 24 = 0
8x = 24
x = 24 : 8
x = 3
Nhớ k cho mình với nhá!
4x : 17 = 0
=> 4x = 0 x17 = 0
=> x = 0 : 4 = 0
7x - 8 = 713
=> 7x = 713 + 8 = 721
=> x = 103
8( x- 3 ) = 0
=> x-3 = 0 : 8 = 0
=> x = 0 + 3 = 3
a) ( x - 8 ) ( x3 +8 ) = 0
=> x - 8 = 0 hoặc x3 + 8 = 0
+) x -8 = 0
x = 8
+) x3 + 8 = 0
x3 =-8 ( vô lí )
Vậy x = 8
a) \(\dfrac{2}{3}x.\left(x-8\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}\dfrac{2}{3}x=0\\x-8=0\end{matrix}\right.\)
\(\Leftrightarrow\left[{}\begin{matrix}x=0\\x=8\end{matrix}\right.\)
Vậy x=0 ; x=8
\(\frac{x+3}{8}=\frac{2}{x-3}\)
\(\left(x+3\right)\times\left(x-3\right)=2\times8\)
\(x^2-3^2=16\)
\(x^2-9=16\)
\(x^2=16+9\)
\(x^2=25\)
\(x^2=\left(\pm5\right)^2\)
\(x=\pm5\)
Vậy x = 5 hoặc x = -5
\(\frac{x+3}{8}=\frac{2}{x-3}\)
\(\Rightarrow\left(x+3\right)\left(x-3\right)=2.8=16\)
\(\Rightarrow x^2-3^2=16\)
\(\Rightarrow x^2=16+3^2=25\)
\(\Leftrightarrow\left[\begin{array}{nghiempt}x=5\\x=-5\end{array}\right.\)
a,\(x^3-x=0\Rightarrow x\left(x^2-1\right)=0\Rightarrow x\left(x+1\right)\left(x-1\right)=0\)
b,\(x^2-2x+x-2=0\Rightarrow x\left(x-2\right)+\left(x-2\right)=0\Rightarrow\left(x-2\right)\left(x+1\right)=0\)
c,\(x^2-6x+8=x^2-4x-2x+8=x\left(x-4\right)-2\left(x-4\right)=\left(x-4\right)\left(x-2\right)\)
\(x^3-x=0\)
\(\Leftrightarrow x\left(x^2-1\right)=0\)
\(\Leftrightarrow x\left(x-1\right)\left(x+1\right)=0\)
x=0 hoặc x-1=0=> x=1 hoặc x+1=0 => x=-1
\(x^2-2x+x-2=0\)
\(\Leftrightarrow x\left(x-2\right)+\left(x-2\right)=0\)
\(\Leftrightarrow\left(x-2\right)\left(x+1\right)=0\)
\(\Leftrightarrow\orbr{\begin{cases}x-2=0\\x+1=0\end{cases}\Leftrightarrow\orbr{\begin{cases}x=2\\x=-1\end{cases}}}\)
\(x^2-6x+8=0\)
\(\Leftrightarrow x^2-2x-4x+8=0\)
\(\Leftrightarrow x\left(x-2\right)-4\left(x-2\right)=0\)
\(\Leftrightarrow\left(x-2\right)\left(x-4\right)=0\)
\(\Leftrightarrow\orbr{\begin{cases}x-2=0\\x-4=0\end{cases}\Leftrightarrow\orbr{\begin{cases}x=0\\x=4\end{cases}}}\)
X - 6 : 2 - (48 - 24) : 2 : 6 - 3 = 0
X - 3 - 24 : 2 : 6 - 3 = 0
X - 3 - 2 - 3 = 0
X = 0 + 3 + 2 + 3
X = 8
X - 6 : 2 - ( 48 - 24 ) : 2 : 6 - 3 = 0
X - 6 : 2 - 24 : 2 : 6 - 3 = 0
X - 3 - 12 : 6 - 3 = 0
X - 3 - 2 - 3 = 0
X = 0 + 3 + 2 + 3
X = 8
Do \(\left(x-7\right)^8\ge0;\left|y^2-4\right|\ge0\)
\(\Rightarrow\left(x-7\right)^8+\left|y^2-4\right|\ge0\)
Mà theo đề bài: (x - 7)8 + |y2 - 4| = 0
=> \(\begin{cases}\left(x-7\right)^8=0\\\left|y^2-4\right|=0\end{cases}\)=> \(\begin{cases}x-7=0\\y^2-4=0\end{cases}\)=> \(\begin{cases}x=7\\y^2=4\end{cases}\)=> \(\begin{cases}x=7\\y\in\left\{2;-2\right\}\end{cases}\)
8 (x-3)=0
8x(x-3)=0
x-3=8x0
x-3=0
x=3
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