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y=﹣2 (x+1)2+3 y=﹣2 (x+1)2﹣3 y=﹣2 (x﹣1)2﹣3 y=﹣2 (x﹣1)2+3
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
y3<y2<y1 y1<y2<y3 y2<y1<y3 y2<y3<y1
y1>y2>y3 y1<y2<y3 y2<y3<y1 y2>y3>y1
2 1 4 3 1 2 1 2 1 2 3 4 2 1 1 2
3x-y-2=0 3x-4y+1=0或3x-y+2=0 3x-y-2=0或3x-4y+1=0 3x-y-2=0或3x-4y-1=0
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=0 2x+y-1=0 2x+y-3=0 x+2y-3=0
3x+2y+8=0 2x+3y-1=0 3x+2y+1=0 2x-3y-1=0
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
2 1 4 3 1 2 1 2 1 2 3 4 2 1 1 2
y=3(x+2)+1 y=3(x-2)+1 y=3(x+2)-1 y=3(x-2)-1
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