(x+2)^2-(x-2)(x+2)=0
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sai roi x(x+2)-2=0 thi x(x+2)=2 thi x thuoc uoc cua 2 con x-2=2/x con lai thi re roi
a, (\(x-2\))2 - (2\(x\) + 3)2 = 0
(\(x\) - 2 - 2\(x\) - 3)(\(x\) - 2 + 2\(x\) + 3) = 0
(-\(x\) - 5)(3\(x\) +1) = 0
\(\left[{}\begin{matrix}-x-5=0\\3x+1=0\end{matrix}\right.\)
\(\left[{}\begin{matrix}x=-5\\3x=-1\end{matrix}\right.\)
\(\left[{}\begin{matrix}x=-5\\x=-\dfrac{1}{3}\end{matrix}\right.\)
Vậy \(x\in\) { -5;- \(\dfrac{1}{3}\)}
b, 9.(2\(x\) + 1)2 - 4.(\(x\) + 1)2 = 0
{3.(2\(x\) + 1) - 2.(\(x\) +1)}{ 3.(2\(x\) +1) + 2.(\(x\) +1)} = 0
(6\(x\) + 3 - 2\(x\) - 2)(6\(x\) + 3 + 2\(x\) + 2) = 0
(4\(x\) + 1)(8\(x\) + 5) =0
\(\left[{}\begin{matrix}4x+1=0\\8x+5=0\end{matrix}\right.\)
\(\left[{}\begin{matrix}x=-\dfrac{1}{4}\\x=-\dfrac{5}{8}\end{matrix}\right.\)
S = { - \(\dfrac{5}{8}\); \(\dfrac{-1}{4}\)}
d, \(x^2\)(\(x\) + 1) - \(x\) (\(x+1\)) + \(x\)(\(x\) -1) = 0
\(x\left(x+1\right)\).(\(x\) - 1) + \(x\)(\(x\) -1) = 0
\(x\)(\(x\) -1)(\(x\) + 1 + 1) = 0
\(x\left(x-1\right)\left(x+2\right)\) = 0
\(\left[{}\begin{matrix}x=0\\x-1=0\\x+2=0\end{matrix}\right.\)
\(\left[{}\begin{matrix}x=0\\x=1\\x=-2\end{matrix}\right.\)
S = { -2; 0; 1}
\(x^2-25+2\left(x+5\right)=0\)
\(\Leftrightarrow\left(x+5\right)\left(x-5\right)+2\left(x+5\right)=0\)
\(\Leftrightarrow\left(x+5\right)\left(x-5+2\right)=0\)
\(\left(x+5\right)\left(x-3\right)=0\)
\(\Leftrightarrow\orbr{\begin{cases}x+5=0\\x-3=0\end{cases}\Leftrightarrow\orbr{\begin{cases}x=-5\\x=3\end{cases}}}\)
\(x\left(x-1\right)+x-1=0\)
\(\Leftrightarrow\left(x-1\right)\left(x+1\right)=0\)
\(\Leftrightarrow\orbr{\begin{cases}x-1=0\\x+1=0\end{cases}\Leftrightarrow}\orbr{\begin{cases}x=1\\x=-1\end{cases}}\)
P/s tham khảo nha
\(2x^2-6x=0\)
\(\Rightarrow2x.\left(x-3\right)=0\)
\(\Rightarrow\left[{}\begin{matrix}2x=0\\x-3=0\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=0:2\\x=0+3\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=0\\x=3\end{matrix}\right.\)
Vậy \(x\in\left\{0;3\right\}.\)
\(2x.\left(x+2\right)-3.\left(x+2\right)=0\)
\(\Rightarrow\left(x+2\right).\left(2x-3\right)=0\)
\(\Rightarrow\left[{}\begin{matrix}x+2=0\\2x-3=0\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=0-2\\2x=3\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=-2\\x=3:2\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=-2\\x=\frac{3}{2}\end{matrix}\right.\)
Vậy \(x\in\left\{-2;\frac{3}{2}\right\}.\)
\(x^3-16x=0\)
\(\Rightarrow x.\left(x^2-16\right)=0\)
\(\Rightarrow x.\left(x^2-4^2\right)=0\)
\(\Rightarrow x.\left(x-4\right).\left(x+4\right)=0\)
\(\Rightarrow\left[{}\begin{matrix}x=0\\x-4=0\\x+4=0\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=0\\x=0+4\\x=0-4\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=0\\x=4\\x=-4\end{matrix}\right.\)
Vậy \(x\in\left\{0;4;-4\right\}.\)
Chúc bạn học tốt!
mình đang cần rất gấp mong các bạn giúp ,ngày mai mình phải nộp cho cô rồi .bạn nào làm nhanh mình k luôn nha
\(\left(x+4\right).\left(-3x+9\right)=\)
\(\Leftrightarrow\orbr{\begin{cases}x+4=0\\-3x+9=0\end{cases}\Leftrightarrow\orbr{\begin{cases}x=0-4\\-3x=0-9\end{cases}\Leftrightarrow}}\orbr{\begin{cases}x=-4\\-3x=-9\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}x=-4\\x=\left(-9\right):\left(-3\right)\end{cases}\Leftrightarrow\orbr{\begin{cases}x=-4\\x=3\end{cases}}}\)
Vậy .....................
~ Hok tốt ~
( 2x - 3 )( x + 1 ) - 2x2 + 6x = 0
<=> 2x2 - x - 3 - 2x2 + 6x = 0
<=> 5x - 3 = 0
<=> 5x = 3
<=> x = 3/5
( x2 - x + 1 )( x - 3 ) - x3 + 4x2 = 0
<=> x3 - 4x2 + 4x - 3 - x3 + 4x2 = 0
<=> 4x - 3 = 0
<=> 4x = 3
<=> x = 3/4
( x2 - 2 )( x2 + 2 ) - x4 - 2x + 5 = 0
<=> ( x2 )2 - 4 - x4 - 2x + 5 = 0
<=> x4 + 1 - x4 - 2x = 0
<=> 1 - 2x = 0
<=> 2x = 1
<=> x = 1/2
( x - 3 )( x2 - 3x + 2 ) - ( x2 - 2x - 7 )( x - 2 ) + 2x2 - 2x = 0
<=> x3 - 6x2 + 11x - 6 - ( x3 - 4x2 - 3x + 14 ) + 2x2 - 2x = 0
<=> x3 - 6x2 + 11x - 6 - x3 + 4x2 + 3x - 14 + 2x2 - 2x = 0
<=> 12x - 20 = 0
<=> 12x = 20
<=> x = 20/12 = 5/3
a, \(\left(2x-3\right)\left(x+1\right)-2x^2+6x=0\)
\(\Leftrightarrow2x^2+2x-3x-3-2x^2+6x=0\Leftrightarrow5x-3=0\Leftrightarrow x=\frac{3}{5}\)
b, \(\left(x^2-x+1\right)\left(x-3\right)-x^3+4x^2=0\)
\(\Leftrightarrow x^3-3x^2-x^2+3x+x-3-x^3+4x^2=0\Leftrightarrow4x-3=0\Leftrightarrow x=\frac{3}{4}\)
c ; d tương tự nhé !
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\(\left(x+2\right)^2-\left(x-2\right)\left(x+2\right)=0\)
\(\left(x+2\right)^2-\left(x^2-4\right)=0\)
\(\left(x+2\right)^2-x^2+4=0\)
\(\left(x+2-x\right)\left(x+2+x\right)=0-4\)
\(2\left(2x+2\right)=-4\)
\(4x+4=-4\)
\(4x=-4-4\)
\(4x=-8\)
\(x=-8\div4\)
\(x=-2\)