[toan 10]hệ pt khso nhăn luôn

L

langtu_ctt2

H[FONT=&quot]ệ phương trình:[/FONT]
2x2+x+y2
xy-x+y
\Leftrightarrowđưa 2 về dạng:x(y-1)+y=3\Leftrightarrowx=...
the 2 vao 1 roi rut gon thanh:

Y4-2y3-5y2+6y+8=0
\Leftrightarrow
Y4-2y3-5y2+10y-4y+8=0
\Leftrightarrow
(y-2)(y3-5y-4) bấm may giai nhe em:p
 
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