解方程:(1)x2-4x+3=0 (2)x2-6x+7=0 (用配方法
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:(1)3(x-2)²-27=0;
3(x-2)^2=27
(x-2)^2=9
x-2=±3
x1=5,
x2=-1
(2)x²-4x+1=0
x^2-4x+4=3
(x-2)^2=3
x-2=±√3
x1=2+√,
x2=2-√3
(3)x²-6x-6=0
x^2-6x+9=6+9
(x-3)^2=15
x-3=±√15
x1=3+1√5,
x2=3-√15
(4)x²-2x-2=0;
x^2-2x+1=2+1
(x+1)^2=3
x+1=±√3
x1=-1+√3,
x2=-1-√3
(5)x²+4x-2=0
x^2+4x+4=2+4
(x+2)^2=6
x+2=±√6
x1=-2+√6,
x2=-2-√6
3(x-2)^2=27
(x-2)^2=9
x-2=±3
x1=5,
x2=-1
(2)x²-4x+1=0
x^2-4x+4=3
(x-2)^2=3
x-2=±√3
x1=2+√,
x2=2-√3
(3)x²-6x-6=0
x^2-6x+9=6+9
(x-3)^2=15
x-3=±√15
x1=3+1√5,
x2=3-√15
(4)x²-2x-2=0;
x^2-2x+1=2+1
(x+1)^2=3
x+1=±√3
x1=-1+√3,
x2=-1-√3
(5)x²+4x-2=0
x^2+4x+4=2+4
(x+2)^2=6
x+2=±√6
x1=-2+√6,
x2=-2-√6
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