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x﹣2y﹣1=0 x﹣2y+1=0 3x﹣2y+1=0 x+2y+3=0
(x1,y1), (x2,y2),则下列判断正确的是( ) A.x1+x2>0,y1+y2>0B.x1+x2>0,y1+y2<0 x1+x2<0,y1+y2>0 x1+x2<0,y1+y2<0
1-xy+y2 1+xy+y2 1-x2y+y2 1+x2y+y2
B.是x轴上的两点,点P.的横坐标为2,且|PA|=|PB|,若直线PA的方程为x﹣y+1=0,则直线PB的方程是( ) A.x+y﹣5=0 2x﹣y﹣1=0 2y﹣x﹣4=0 2x+y﹣7=0
, 是x轴上的两点,点P.的横坐标为2,且|PA|=|PB|,若直线PA的方程为x-y+1=0,则直线PB的方程是( ) A.2y-x-4=0 B.2x-y-1=0 x+y-5=0 2x+y-7=0
m>-1且n<5 m<-1且n<5 m>-1且n>5 m<-1且n>5
x-y-2=0或5x+4y-1=0 x-y-2=0 x-y+2=0 x-y-2=0或4x+5y+1=0
x+y+2=0 x+y﹣1=0 x+y=0 x+y﹣2=0
3x+2y+8=0 2x+3y-1=0 3x+2y+1=0 2x-3y-1=0
y1>y2>y3 y1<y2<y3 y2>y3>y1 y2<y3<y1
a=2,b=3 a=-2,b=-3
P{Y=-2X-1}=1 P{Y=2X-1}=1 P{Y=-2X+1}=1 P{Y=2X+1}=1
α=-3,β=1 α=-1,β=-1 α=0,β=2 α=1,β=-3
’x’&&’z’ (!y==1)&&(!z==0) (x1 br="">x y+y&&z-y1>
y-3x+1=0 x-y+3=0 2x-y-3=0 2x-y+3=0