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X1 X2
(Xl,X2) (Xl,X2,X3,X4)
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
X1 X2 (X1,X2) (X1,X2,X3,X4)
X1 X2 (X1,X2) (X1,X2,X3,X4)
X1 X2 (X1,X2) (X1,X2,X3,X4)
2x﹣4y﹣3=0 2x+4y+3=0 4x﹣2y﹣3=0 2x+4y﹣3=0
X5, Y2 X3, Y2 X4, Y3 X4, Y1
Y1=0.4636X1-0.2411X2+0.6126X3-0.3821X4-0.4535X5 Y1=2.8562X1+0.8090X2+0.5401X3+0.4516X4+0.343X5 Y1=0.4636X1+0.4571X2+0.47X3+0.4217X4+0.4213X5 Y1=0.8635X1+0.8236X2+0.7469X3+0.8882X4+0.8832X5
X1 X2 (Xl,X2) (Xl,X2,X3,X4)