1.$\left\{\begin{array}{l}x+y+xy=11\\ x^2y+xy^2=30\end{array}\right.$
2.$\left\{\begin{array}{l}x-y+xy=1\\2 \sqrt{x}+y-xy=2\end{array}\right. $
3.$\left\{\begin{array}{l}x-y+z=2\\2x^2-xy+x-2z=1\end{array}\right. $
4.$ \left\{\begin{array}{l}x^2+y^2=2y+1\\xy=x+1\end{array}\right. $
5.$ \left\{\begin{array}{l}x^2+4y^2=4\\4xy+x+2y=-2\end{array}\right. $
6.$ \left\{\begin{array}{l}x- \dfrac{1}{x}=y- \dfrac{1}{y} \\x^3-2y+1=0\end{array}\right. $
nhiu đó đủ rồi
Bài viết đã được chỉnh sửa nội dung bởi hoangngocbao1997: 22-07-2011 - 08:24