càng đơn giản càng khó ==.
giải hệ trên trường số thực:

$\begin{cases}x\sqrt{x}(3\sqrt{y}+2)=8 \\ \sqrt{x}(y\sqrt{y}-2)=6 \end{cases}$
ĐK $x,y\geq 0$
+ Xét x=0 $\Rightarrow $ ,..........
+ Xét x$\neq $ 0 thì hệ tg đg:
$\left\{ \begin{array}{l} 3\sqrt{y}+2=\frac{8}{x\sqrt{x}}\\ y\sqrt{y}-2=\frac{6}{\sqrt{x}} \end{array} \right.$
cộng 2 vế 2 pt đc pt đ/x:
$y\sqrt{y}+3\sqrt{y}$= $\frac{8}{x\sqrt{x}}+\frac{6}{\sqrt{x}}$
$\Leftrightarrow $ $y\sqrt{y}+3\sqrt{y}$ = $(\frac{2}{\sqrt{x}})^3+3.(\frac{2}{\sqrt{x}})$
bạn lm tiếp nha! đến đây có nhiều cách lm lắm!

thôi bn đừng có chém,-___-'',dạo này htn toàn thánh pro,^_^ –  ๖ۣۜTQT☾♋☽ 19-02-16 08:05 PM
nản ah!!!!! –  Confusion 19-02-16 08:04 PM
trùi ui!!! m chỉ lm 1 vài bc biến đổi bình thường thui!!! –  Confusion 19-02-16 08:04 PM
tiếc là dùng hết luotj vote r –  ๖ۣۜTQT☾♋☽ 19-02-16 08:03 PM
ùi,pro quá –  ๖ۣۜTQT☾♋☽ 19-02-16 08:03 PM
ko co chi hjhj –  Confusion 19-02-16 08:03 PM
quả thực là vậy. phương pháp hàm số. cảm ơn bạn nhé :D –  Bùi Cao Thắng 19-02-16 07:54 PM
vote nhiệt tình nha các bác!!! Thanks!!! –  Confusion 19-02-16 07:06 PM

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