×的平方减2Ⅹ+1=0的解集
1.2\u5e73\u65b9\u7c73\u51cf0.8\u5e73\u65b9\u5206\u7c73\u7b49\u4e8e\u591a\u5c11\u5e73\u65b9\u5206\u7c731.2\u5e73\u65b9\u7c73=120\u5e73\u65b9\u5206\u7c73\uff1b120-0.8=119.2\u5e73\u65b9\u5206\u7c73
(a+1)²-a²=2a+1
\u5176\u5b9e\u8fd9\u662f\u5e73\u65b9\u5dee\u516c\u5f0f\uff1aa²-b²=\uff08a+b)(a-b)
即（x－1）的平方=0
x=1
解集是{1}
x^2-2x+1=0
(x-1)^2=0
x=1
解集为：{x|x=1}
绛旓細鍒╃敤瀹屽叏骞虫柟宸叕寮忥細鎵姹傛柟绋嬪彲鍖栫畝涓猴紝锛坸-1锛鐨勫钩鏂=0锛岃В鏂圭▼鍙緱锛x=1锛屾墍浠ユ柟绋鐨勮В闆涓簕X|X=1}
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绛旓細x²+2=0 x²=-2 鈭祒²鈮0 鈭存柟绋嬫棤瀹炴暟瑙
