x²-4x+2
=x²-4x+4-2
=(x-2)²-1
x²-4x+2
=x²+2√2x+2-4x-2√2x
=(x+√2)²-(4-2√2)x
x²-4x+2
=2x²-4x+2-x²
=2(x-1)²-x²
（x-1)^2+3,(x-2)^2+2x,(1/2x-2)^2+3/4x^2是x^2-2x+4的三种不同形式的配方,求x
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