Giai hệ phương trình : \(\left\{{}\begin{matrix}\sqrt{x-y+z}=\sqrt{x}-\sqrt{y}+\sqrt{z}\\\frac{1}{x}+\frac{1}{y}+\frac{1}{z}=1\end{matrix}\right.\)
a)\(\left\{{}\begin{matrix}\frac{x-12}{4}=\frac{y-9}{3}=z-1\\3x+5y-z=2\end{matrix}\right.\)
b)\(\left\{{}\begin{matrix}\frac{a+b}{6}=\frac{b+c}{7}\frac{a+c}{8}\\a+b+c=14\end{matrix}\right.\)
c)\(\left\{{}\begin{matrix}x+y+z=9\\\frac{1}{x}+\frac{1}{y}+\frac{1}{z}=1\\zy+yz+zx=27\end{matrix}\right.\)
Giai hệ phương trình \(\left\{{}\begin{matrix}\frac{2x^2}{1+x^2}=y\\\frac{2y^2}{1+y^2}=x\\\frac{2z^2}{1+z^2}=z\end{matrix}\right.\)
Giải hệ phương trình
\(\left\{{}\begin{matrix}x\left(yz+1\right)=\frac{7}{3}z\\y\left(xz+1\right)=8x\\z\left(xy+1\right)=\frac{9}{2}y\end{matrix}\right.\)
Giai hệ phương trình: \(\left\{{}\begin{matrix}x+y+\frac{1}{y}=\frac{9}{x}\\x+y-\frac{4}{x}=\frac{4y}{x^2}\end{matrix}\right.\)
Giải hệ phương trình
\(\left\{{}\begin{matrix}x+y+z=3\\\frac{1}{x}+\frac{1}{y}+\frac{1}{z}=\frac{1}{3}\\2x^2+y=1\end{matrix}\right.\)
1. Giải hpt: \(\left\{{}\begin{matrix}x+y+z=0\\2x+3y+z=0\\\left(x+1\right)^2+\left(y+2\right)^2+\left(z+3\right)^2=26\end{matrix}\right.\)
2. Cho x,y,z là nghiệm của hpt : \(\left\{{}\begin{matrix}\frac{x}{3}+\frac{y}{12}-\frac{z}{4}=1\\\frac{x}{10}+\frac{y}{5}+\frac{z}{3}=1\end{matrix}\right.\) . Tính \(A=x+y+z\)
a)\(\left\{{}\begin{matrix}x+y+z=9\\\frac{1}{x}+\frac{1}{y}+\frac{1}{z}=1\\xy+yz+zx=27\end{matrix}\right.\)
b)\(\left\{{}\begin{matrix}x-y=7\\x^3+y^3=133\end{matrix}\right.\)
c)\(\left\{{}\begin{matrix}x^2-5x+y=0\\x-\sqrt{y}+1=0\end{matrix}\right.\)
giải hệ phương trình \(\left\{{}\begin{matrix}y=x^2\\\frac{1}{x}=\frac{1}{y}+\frac{1}{z}\\z=xy\end{matrix}\right.\)