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X1 X2
(Xl,X2) (Xl,X2,X3,X4)
X1 X2 (X1,X2) (X1,X2,X3,X4)
X1 X2 (X1,X2) (X1,X2,X3,X4)
X1 X2 (X1,X2) (X1,X2,X3,X4)
x2=-2,解方程,得x=± (x-2)2=4,解方程,得x-2=2,x=4 4(x-1)2=9,解方程,得4(x-1)=±3,x1=,x2= (2x+3)2=25,解方程,得2x+3=±5,x1=1,x2=-4
X1 X2 (Xl,X2) (Xl,X2,X3,X4)