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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
f(x，y)=3(x+y)+32xy f(x，y)=3(x+y)-32xy f(x，y)=3(x+y)-16xy f(x，y)=3(x+y)+16xy
x＝2，y＝2 x=3，y＝3 x＝2，y＝3 x＝3，y＝2
y3＜y2＜y1 y1＜y2＜y3 y2＜y1＜y3 y2＜y3＜y1
(x,3)与点 (2,y)关于x轴对称,则( ) A.x=-2,y=-3; B.x=2,y=3; x=-2,y=3; x=2,y=-3
y=2x+3 y=2x﹣3 y﹣3=2x+3 y=3x﹣3
3(x＋y2)(x－y2) 3(x＋y2)(x＋y)(x－y) 3(x－y2)2 3(x－y)2(x＋y)2
-3x2y·5x2y=2x2y -2x2y3·2x3y=-2x5y4 35x3y2÷5x2y=7xy (-2x-y)(2x+y)=4x2-y2
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
y=2x+3 y=2x－3 y－3=2x+3 y=3x－3
f(x，y)=3(x+y)+32xy f(x，y)=3(x+y)-32xy f(x，y)=3(x+y)-16xy f(x，y)=3(x+y)+16xy
－2x+3y 2x－3y －2x－3y 2x＋3y
﹣（2x+y）=﹣2x+y 2（x﹣y）=2x﹣y 3x﹣（2y+z）=3x﹣2y﹣z x﹣（﹣y+z）=x﹣y﹣z
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＋y＋3）（x－y－1）. （x＋y－1）（x－y＋3） （x＋y－3）（x－y＋1）. （x＋y＋1）（x－y－3）
x=2,y=2 x=3,y:3 x=2,y=3 x=3,y=2
2x2-xy-x=2x(x-y-1) -xy2+2xy-3y=-y(xy-2x-3) x(x-y)-y(x-y)=(x-y)2 x2-x-3=x(x-1)-3
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
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