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X1 X2
(Xl,X2) (Xl,X2,X3,X4)
X1 X2 (X1,X2) (X1,X2,X3,X4)
x1=10,x2=2 x1=12,x2=10 x1=12,x2=2 x1=2,x2=2
X1 X2 (X1,X2) (X1,X2,X3,X4)
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-∞<X2<+∞ 0≤X2≤+∞ X2≤1 -∞≤X2≤0 X2≥1
X1 X2 (X1,X2) (X1,X2,X3,X4)
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x=2 x=0 x1=0, x2=2 x1=0, x2=-2
x1=10,x2=2 x1=12,x2=10 x1=12,x2=2 x1=2,x2=2
x1=10,x2=2 x1=12,x2=10 x1=12,x2=2 x1=2,x2=2
X1 X2 (Xl,X2) (Xl,X2,X3,X4)