解方程:x2-2x-1=0.

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解方程:x2-2x-1=0.

解方程:x2-2x-1=0.
解方程:x2-2x-1=0.

解方程:x2-2x-1=0.
x2-2x-1=0
(x-1)^2=0
x-1=0
x=1.

x²-2x=1
x²-2x+1=2
(x-1)²=2
x=1+√2 x=1-√2

x²-2x-1=0
(x-1)²=2
x-1=±√2
x1=1+√2 x2=1-√2

x2-2x-1=0.
x²-2x+1=2
(x-1)²=2
x-1=±√2
x1=1+√2, x2=1-√2