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\(1.\)

\(2x^3+x+3=0\)

\(\Leftrightarrow\)  \(\left(x+1\right)\left(2x^2-2x+3\right)=0\)  \(\left(1\right)\)

Vì  \(2x^2-2x+3=2\left(x^2-x+1\right)+1=2\left(x-\frac{1}{2}\right)^2+\frac{1}{2}>0\)  với mọi  \(x\in R\)

nên từ  \(\left(1\right)\)  \(\Rightarrow\)  \(x+1=0\)  \(\Leftrightarrow\)  \(x=-1\)

1)2x^3+x+3=0=>

ĐKXĐ: \(x\ge\dfrac{2}{7}\)

\(\sqrt{5x^2-5x+3}-\left(x+1\right)+2x-\sqrt{7x-2}+4x^2-7x+2=0\)

\(\Leftrightarrow\dfrac{4x^2-7x+2}{\sqrt{5x^2-5x+3}+\left(x+1\right)^2}+\dfrac{4x^2-7x+2}{2x+\sqrt{7x-2}}+4x^2-7x+2=0\)

\(\Leftrightarrow\left(4x^2-7x+2\right)\left(\dfrac{1}{\sqrt{5x^2-5x+3}+\left(x+1\right)^2}+\dfrac{1}{2x+\sqrt{7x-2}}+1\right)=0\)

Ta có \(\dfrac{1}{\sqrt{5x^2-5x+3}+\left(x+1\right)^2}+\dfrac{1}{2x+\sqrt{7x-2}}+1>0\)

\(\Rightarrow4x^2-7x+2=0\)

\(\Rightarrow\left[{}\begin{matrix}x=\dfrac{7-\sqrt{17}}{8}\\x=\dfrac{7+\sqrt{17}}{8}\end{matrix}\right.\)

\(\)

a)Dat \(x^2-4x+3=a;x^2-7x+6=b \Rightarrow a+b=2x^2-11x+9\)

....

\(2x^4+7x^3+x^2-7x-3=0\)

\(\Leftrightarrow2x^4+7x^3+3x^2-2x^2-7x-3=0\)

\(\Leftrightarrow\left(2x^4+7x^3+3x^2\right)-\left(2x^2+7x+3\right)=0\)

\(\Leftrightarrow x^2\left(2x^2+7x+3\right)-\left(2x^2+7x+3\right)=0\)

\(\Leftrightarrow\left(x^2-1\right)\left(2x^2+7x+3\right)=0\)

\(\Leftrightarrow\left(x+1\right)\left(x-1\right)\left(x+3\right)\left(2x+1\right)\)

\(\Leftrightarrow x\in\left\{\pm1;\frac{-1}{2};-3\right\}\)

\(Đk:x\ge\dfrac{3}{2}\Rightarrow x>0\)

\(x^3-4x^2+5x-1-\sqrt{2x-3}=0\)

\(\Leftrightarrow2x^3-8x^2+10x-2-2\sqrt{2x-3}=0\)

\(\Leftrightarrow\left(2x^3-8x^2+8x\right)+\left[\left(2x-3\right)-2\sqrt{2x-3}+1\right]=0\)

\(\Leftrightarrow2x\left(x-2\right)^2+\left(\sqrt{2x-3}-1\right)^2=0\)

Ta có: \(\left\{{}\begin{matrix}2x\left(x-2\right)^2\ge0\left(x>0\right)\\\left(\sqrt{2x-3}-1\right)^2\ge0\end{matrix}\right.\)

\(\Rightarrow2x\left(x-2\right)^2+\left(\sqrt{2x-3}-1\right)^2\ge0\)

Do đó: \(\left\{{}\begin{matrix}2x\left(x-2\right)^2=0\\\left(\sqrt{2x-3}-1\right)^2=0\end{matrix}\right.\Leftrightarrow x=2\)

Thử lại ta có x=2 là nghiệm duy nhất của phương trình đã cho.

x^3-4x^2+5x-1-căn 2x-3=0

=>\(x^3-4x^2+5x-2-\left(\sqrt{2x-3}-1\right)=0\)

=>\(\left(x-1\right)\left(x-2\right)^2-\dfrac{2x-3-1}{\sqrt{2x-3}+1}=0\)

=>\(\left(x-2\right)\left[\left(x-1\right)\left(x-2\right)-\dfrac{2}{\sqrt{2x-3}+1}\right]=0\)

=>x-2=0

=>x=2

a, \(x^4-5x^3+2x^2+10x+2=0\)

\(\Rightarrow x^4+x^3-6x^3-6x^2+8x^2+8x+2x+2=0\)

\(\Rightarrow x^3\left(x+1\right)-6x^2\left(x+1\right)+8x\left(x+1\right)+2\left(x+1\right)=0\)

\(\Rightarrow\left(x+1\right)\left(x^3-6x^2+8x+2\right)=0\)

Vì \(x^3-6x^2+8x+2>0\) nên \(x+1=0\Rightarrow x=-1\)

Các câu còn lại tương tự!

Chúc bạn học tốt!!!

Tới đoạn \(\left(x+1\right)\left(x^3-6x^2+8x+2\right)=0\)

Vì \(x^3-6x^2+8x+2\)(bấm máy tính kiểm tra nhé) khác 0 nên x+1=0

Do đó x=-1

Vậy x=-1

Chúc bạn học tốt ạNhung Phan