1,$\left\{ \begin{array}{l} x^{2}y+xy^{2}+x+y+xy=11\\ 3x^{2}y-xy^{2}+3x-y+xy=17 \end{array} \right.$
2, $\begin{cases}x^{2}\sqrt{y+1}-2xy-2x=1 \\ x^{3}-3x-3xy=6 \end{cases}$
hệ 1pt(1)<=> (xy 1)(x y 1)=12 (*)pt(2) <=> (xy 1)(3x-y 1)=18(1):(2) =>3x-5y-1=0 => thay x=(5y 1)/3 vào (*) => y=1 ; x=2 –  dokhachuong95 11-12-13 03:40 PM

Câu hỏi này được treo giải thưởng trị giá +1000 vỏ sò bởi Bảo Ngọc, đã hết hạn vào lúc 02-12-13 09:22 PM

dat a=$\sqrt{y+1}$
$\Rightarrow\left\{ \begin{array}{l} x2a-2xa2=1\\ x3-3xa2=6 \end{array} \right. $
nhan cheo hai duoc :x2-6xa+9a2=0
$\Leftrightarrow x=3a\Rightarrow x=3\sqrt{y+1}$
the vao phuong trinh 1 duoc:tim duoc x va y
Chu y:toi khong biet go bac cua an !!!!!!!!!!!!!!!!

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