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X2+2Y2
2XY2 2X2+Y22X2Y 3X2+Y22X3Y X2+3Y22XY3
x=3,y=2 x=3,y=2 x=2,y=3 x=3,y=2 x=2,y=3 x=2,y=3 x=3,y=2 x=2,y=3
［x-(2y+1)］2 ［x-(2y-1)］［x+(2y-1)］ ［(x-2y)+1］［(x-2y)-1］ ［x+(2y-1)］2
(2a＋b)(2a－3b) (x－2y)(x＋2y) (x＋1)(1＋x) (－x－y)(x＋y)
[x﹣（2y+1）]2 [x+（2y﹣1）][x﹣（2y﹣1）] [（x+2y）﹣1][（x﹣2y）+1] [x+（2y+1）]2
5x-y-3=0 14x-y-12=0 5x+y-3=0 14x+y-12=0
X2+2Y2 2XY2 2X2+Y2 2X2Y 3X2+Y2 2X3Y X2+3Y2 2XY3
X2+2Y2
2XY2 2X2+Y22X2Y 3X2+Y22X3Y X2+3Y22XY3
x+2; x-12y+2; -5x+12y+2; 2-5x.
X2+2Y2==2XY2 2X2+Y2==2X2Y 3X2+Y2==2X3Y X2+3Y2==2XY3
If x＜0 Then y=0 If x＜1 Then y=1 If x＜2 Then y=2 If x＞=2 Then y=3 If x＞=2 Then y=3 If x＞1 Then y=2 If x＞=0Then y=1 If x＞0 Then y=0 If x＜0 Then y=0 Else If＞=0Then y=1 Else y=3 End If If x＞=2 Then y=3 Else If＞=1 Then y=2 Else y=0 End If
4x2y2 －4x2y2 －12x3y3 12x3y3
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