用配方法解方程!2x²-4x+1=0
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用配方法解方程!2x²-4x+1=0
2x²-4x+1=0
x^2-2x=-1/2
x^2-2x+1=1-1/2=1/2
(x-1)^2=1/2
x-1=±√2/2
x=1±√2/2
用配方法解方程!2x²-4x+1=0
2x²-4x+1=0
x^2-2x=-1/2
x^2-2x+1=1-1/2=1/2
(x-1)^2=1/2
x-1=±√2/2
x=1±√2/2