2x²-4x+1 = 0 2(x²-2x+1) - 1=0 2(x-1)² - 1 = 0 (x-1)² = 1/2 x-1 = ± (√2)/2 x = 1± (√2)/2 如果本题有什么不明白可以追问,如果满意请点击“选为满意答案”
