x方-4x=4,求x=?

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x方-4x=4,求x=?

x方-4x=4,求x=?
x方-4x=4,求x=?

x方-4x=4,求x=?
x²-4x=4
x²-4x+4=8
(x-2)²=8
x-2=±2√2
x1=2+2√2,x2=2-2√2