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\(\Leftrightarrow x^2-6x+9-x^2+4=1\)
=>-6x=-12
hay x=2
= x3 + 33 -x(x2 -1) -27 =0 ( tổng các lập phuong)
x =0
CX100%
Ta có: \(\left(3x-1\right)\left(2x+7\right)-\left(x+1\right)\left(6x-5\right)=\left(x+2\right)-\left(x-5\right)\)
\(\Leftrightarrow6x^2+21x-2x-7-6x^2+5x-6x+5=x+2-x+5\)
\(\Leftrightarrow18x-2=7\)
\(\Leftrightarrow18x=9\)
hay \(x=\dfrac{1}{2}\)
https://lazi.vn/edu/exercise/giai-phuong-trinh-x-1-x-22-x-1-x-4-32x-4-x-42-0-1
chỉ tiềm thấy cái này thôi ~ vì mk k thể giải đc nên nhờ mạng nên thông cảm cho nha
pt: \(\left(1-2x\right)\left(x+3\right)\left(x^2+2\right)=0\)\(\Leftrightarrow\hept{\begin{cases}1-2x=0\\x+3=0\\x^2+2=0\end{cases}}\)\(\Leftrightarrow\hept{\begin{cases}x=\frac{1}{2}\\x=-3\\x^2=-2\left(loại\right)\end{cases}}\)
vậy: \(x=\frac{1}{2}\),\(x=-3\)
a) \(\left(x+2\right)^2=4\left(2x-1\right)^2\)
\(\left(x+2\right)^2-4\left(2x-1\right)^2=0\)
\(\left(x+2\right)^2-\left[2\left(2x-1\right)\right]^2=0\)
\(\left(x+2\right)^2-\left(4x-2\right)^2=0\)
\(\left(x+2-4x+2\right)\left(x+2+4x-2\right)=0\)
\(6x\left(-3x+4\right)=0\)
\(\Rightarrow6x=0\) hoặc \(-3x+4=0\)
*) \(6x=0\)
\(x=0\)
*) \(-3x+4=0\)
\(3x=4\)
\(x=\dfrac{4}{3}\)
Vậy \(x=0;x=\dfrac{4}{3}\)
b) \(4x\left(x-2019\right)-x+2019=0\)
\(4x\left(x-2019\right)-\left(x-2019\right)=0\)
\(\left(x-2019\right)\left(4x-1\right)=0\)
\(\Rightarrow x-2019=0\) hoặc \(4x-1=0\)
*) \(x-2019=0\)
\(x=2019\)
*) \(4x-1=0\)
\(4x=1\)
\(x=\dfrac{1}{4}\)
Vậy \(x=\dfrac{1}{4};x=2019\)
\(\left(x-3\right)^2+\frac{1}{2}=\left(x-1\right)\cdot\left(x+1\right)\)
\(x^2-6x+9+\frac{1}{2}=x^2-1\)
\(x^2-6x+9\frac{1}{2}=x^2-1\)
\(x^2-6x-x^2=-1-9\frac{1}{2}\)
\(\left(x^2-x^2\right)-6x=-10\frac{1}{2}\)
\(-6x=-10\frac{1}{2}\)
\(x=-10\frac{1}{2}:\left(-6\right)\)
\(x=1\frac{3}{4}\)
(x-3)^2 +1/2= (x-1)*(x+1)
\(\Leftrightarrow x^2-6x+\frac{19}{2}=x^2-1\)
\(\Leftrightarrow x^2-6x+\frac{19}{2}-x^2+1=0\)
\(\Leftrightarrow\left(x^2-x^2\right)+\frac{19}{2}+1-6x=0\)
\(\Leftrightarrow\frac{21}{2}-6x=0\)
\(\Leftrightarrow\frac{21}{2}-\frac{12x}{2}=0\)
\(\Leftrightarrow-\frac{3\left(4x-7\right)}{2}=0\)
\(\Leftrightarrow3\left(4x-7\right)=0\)
\(\Leftrightarrow4x-7=0\)
\(\Leftrightarrow4x=7\)
\(\Leftrightarrow x=\frac{7}{4}\)