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x﹣2y﹣1=0 x﹣2y+1=0 3x﹣2y+1=0 x+2y+3=0
(x+1)(y+1)=2,z=3 (x+1)(y-1)=2,z=3 (x+1)(y-1)=-2,z=3 (x+1)(y+1)=-2,z=3
y1>y2>y3 y1<y2<y3 y2<y3<y1 y2>y3>y1
1-xy+y2 1+xy+y2 1-x2y+y2 1+x2y+y2
={(x,y)|4x+y=6}, ={(x,y)|3x+2y=7},则A.∩B.等于( ) A.{x=1,或y=2}B.{1,2} {(1,2)} (1,2)
={(x,y)| y=-4x+6}, ={(x,y)| y=5x-3},则A.∩B.为 A.{1,2}B.{(1,2)} {x=1,y=2} (1,2)
c1y1+c2y2+y3 c1y1+c2y2-(c1+c3)y3 c1y1+c2y2-(1-c1-c2)y3 c1y1+c2y2+(1-c1-c2)y3
y1>y2>y3 y1<y2<y3 y2<y3<y1 y2>y3>y1
y1>y2>y3 y1<y2<y3 y2>y3>y1 y2<y3<y1
y=(Ax2+Bx)ex y=(Ax+ex y=A2ex y=Axex
y-3x+1=0 x-y+3=0 2x-y-3=0 2x-y+3=0
y-3x+1=0 x-y+3=0 2x-y-3=0 2x-y+3=0