Toán Lớp 6: Tìm x, y sao cho: xy – 2x + y +1 = 0
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Toán Lớp 6: Tìm x, y sao cho: xy – 2x + y +1 = 0
Comments ( 2 )
=>x(y-2)+y+(-2+3)=0
=>x(y-2)+(y-2)=0-3
=>(x+1)(y-2)=-3
Mà -3=1.(-3)=(-3).1=(-1).3=3.(-1)
Ta có bảng sau:
$\begin{array}{|c|c|}\hline x+1&1&-3&-1&3\\\hline y-2&-3&1&3&-1\\\hline x&0&-4&-2&2\\\hline y&-1&3&5&1\\\hline\end{array}$
Vậy (x;y)={(0;-1);(-4;3);(-2;5);(2;1)}