Với điều kiện đã cho thì không tìm được $x,y,z$ cụ thể bạn nhé.

1) \(8x^3-12x^2+6x-1=0\)

\(\Leftrightarrow\left(2x\right)^2-3\cdot\left(2x\right)^2\cdot1+3\cdot2x\cdot1^2-1^3=0\)

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

\(\Leftrightarrow2x-1=0\)

\(\Leftrightarrow2x=1\)

\(\Leftrightarrow x=\dfrac{1}{2}\)

2) \(x^3-6x^2+12x-8=27\)

\(\Leftrightarrow x^3-3\cdot x^2\cdot2+3\cdot2^2\cdot x-2^3=27\)

\(\Leftrightarrow\left(x-2\right)^3=27\)

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

\(\Leftrightarrow x-2=3\)

\(\Leftrightarrow x=3+2\)

\(\Leftrightarrow x=5\)

3) \(x^2-8x+16=5\left(4-x\right)^3\)

\(\Leftrightarrow\left(x-4\right)^2=5\left(4-x\right)^3\)

\(\Leftrightarrow\left(4-x\right)^2=5\left(4-x\right)^3\)

\(\Leftrightarrow5\left(4-x\right)=1\)

\(\Leftrightarrow4-x=\dfrac{1}{5}\)

\(\Leftrightarrow x=4-\dfrac{1}{5}\)

\(\Leftrightarrow x=\dfrac{19}{5}\)

4) \(\left(2-x\right)^3=6x\left(x-2\right)\)

\(\Leftrightarrow8-12x+6x^2-x^3=6x^2-12x\)

\(\Leftrightarrow-12x+6x^2-6x^2+12x=8-x^3\)

\(\Leftrightarrow8-x^3=0\)

\(\Leftrightarrow x^3=8\)

\(\Leftrightarrow x^3=2^3\)

\(\Leftrightarrow x=2\)

5) \(\left(x+1\right)^3-\left(x-1\right)^3-6\left(x-1\right)^2=-10\)

\(\Leftrightarrow x^3+3x^2+3x+1-x^3+3x^2-3x+1-6\left(x^2-2x+1\right)=-10\)

\(\Leftrightarrow\left(x^3-x^3\right)+\left(3x-3x\right)+\left(3x^2+3x^2\right)+\left(1+1\right)-6x^2+12x-6=-10\)

\(\Leftrightarrow0+0+0+\left(6x^2-6x^2\right)+12x-4=-10\)

\(\Leftrightarrow12x-4=-10\)

\(\Leftrightarrow12x=-10+4\)

\(\Leftrightarrow12x=-6\)

\(\Leftrightarrow x=\dfrac{-6}{12}\)

\(\Leftrightarrow x=-\dfrac{1}{2}\)

6) \(\left(3-x\right)^3-\left(x+3\right)^3=36x^2-54x\)

\(\Leftrightarrow27-27x+9x^2-x^3-x^3-9x^2-27x-27=36x^2-54x\)

\(\Leftrightarrow-54x-2x^3=36x^2-54x\)

\(\Leftrightarrow-2x^3=36x^2\)

\(\Leftrightarrow-2x^3-36x^2=0\)

\(\Leftrightarrow-2x^2\left(x+18\right)=0\)

\(\Leftrightarrow\left[{}\begin{matrix}-2x^2=0\\x+18=0\end{matrix}\right.\)

\(\Leftrightarrow\left[{}\begin{matrix}x=0\\x=-18\end{matrix}\right.\)

\(x^2-2x+5+y^2-4y=0\)

\(x^2-2\times x\times1+1^2-1^2+y^2-2\times y\times2+2^2-2^2+5=0\)

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

\(\left(x-1\right)^2\ge0\)

\(\left(y-2\right)^2\ge0\)

\(\Rightarrow\left(x-1\right)^2+\left(y-2\right)^2=0\)

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

\(\Leftrightarrow x-1=y-2=0\)

\(\Leftrightarrow x=1;y=2\)

\(x^2+4y^2+13-6x-8y=0\)

\(\Leftrightarrow x^2-6x+9+4y^2-8y+4=0\)

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

Dấu = xảy ra khi

\(\orbr{\begin{cases}x-3=0\\2y-2=0\end{cases}}\)

\(\Leftrightarrow\orbr{\begin{cases}x=3\\y=1\end{cases}}\)

1) x² - 2x + 5 + y² - 4y = 0

<=> x² - 2x + 1 + y² - 4y + 4 = 0

<=> ( x - 1 )² + ( y - 2 )² = 0

<=> \(\hept{\begin{cases}x-1=0\\y-2=0\end{cases}}\Leftrightarrow\hept{\begin{cases}x=1\\y=2\end{cases}}\)

2) x² + 4y² + 13 - 6x - 8y = 0

<=> x² - 6x + 9 + 4y² - 8y + 4 = 0

<=> ( x - 3 )² + ( 2y - 2 )² = 0

<=> \(\hept{\begin{cases}x-3=0\\2y-2=0\end{cases}}\Leftrightarrow\hept{\begin{cases}x=3\\y=1\end{cases}}\)

3) x² + y² + 6x - 10y + 34 = 0

<=> x² + 6x + 9 + y² - 10y + 25 = 0

<=> ( x + 3 )² + ( y - 5 )² = 0

<=> \(\hept{\begin{cases}x+3=0\\y-5=0\end{cases}}\Leftrightarrow\hept{\begin{cases}x=-3\\y=5\end{cases}}\)

x2−6x+y2+10y+34=−(4z−1)2
x^2-6x+9+y^2+10y+25+(4z-1)^2=0x2−6x+9+y2+10y+25+(4z−1)2=0
(x-3)^2+(y+5)^2+(4z-1)^2=0(x−3)2+(y+5)2+(4z−1)2=0
{nghiempt}x-3=0\\y+5=0\\4z-1=0
{nghiempt}x=3\\y=-5\\z={1}{4}

3: \(\Leftrightarrow a-15=0\)

hay a=15

a) x (3x - 2) - 3x (x + 5) = - 34

<=> 3x²-2x-3x²-15x=-34

<=>-17x=-34

<=>x=\(\frac{-34}{-17}\)

<=>x=2

b) (2x + 3) . (3x - 2) - 6x . (x - \(\frac{1}{2}\) )  = 26

<=>6x²-4x+9x-6-6x² +3x=26

<=>8x=26+6=32

<=>x=32:8=4

nếu đúng nhớ k cho mk và kết bn nha!mk trả lời nhanh nhất đó. thank. chúc bn học tốt!

a) \(\Leftrightarrow x=2\)

b) \(\Leftrightarrow x=32\div8=4\)

Hk tốt

a)\(x\left(3x-2\right)-3x\left(x+5\right)=-34\)

\(\Leftrightarrow3x^2-2x-3x^2-15x=-34\)

\(\Leftrightarrow15x-2x=-34\)

\(\Leftrightarrow13x=-34\)

\(\Leftrightarrow x=\frac{-34}{13}\)

b) \(\left(2x+3\right)\left(3x-2\right)-6x\left(x-\frac{1}{2}\right)=26\)

\(\Leftrightarrow6x^2+5x-6-6x^2+3x=26\)

\(\Leftrightarrow8x-6=26\)

\(\Leftrightarrow8x=26+6\)

\(\Leftrightarrow8x=32\)

\(\Leftrightarrow x=32\div8\)

\(\Leftrightarrow x=4\)

Vậy \(x=4\)

cho to đề di to giai cho

Bạn ơi đầu bài đâu mà làm? =="

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x²-6x+y²+10y+34=-(4z-1)²

=>x²-6x+9+y²+10y+25+(4z-1)²=0=B

=>(x-3)²+(y+5)²+(4z-1)²=0

với mọi x,y,z ta có :

(x-3)²>=0

(y+5)²>=0

(4z-1)²>=0

=>(x-3)²+(y+5)²+(4z-1)²>=0

hay B>=0

dấu bằng xảy ra khi (x-3)²=0 => x-3=0  =>x=3

=>(y+5)²=0 =>y+5=0  =>y=-5

=>(4z-1)²=0 =>4z-1=0  => z=1/4

Vậy y=-5