(x-1)²-400=0

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(x-1)²-400=0(x-1)²-400=0(x-1)²-400=0(x-1)²=400x-1=±20x=21或-1921没答案

(x-1)²-400=0
(x-1)²-400=0

(x-1)²-400=0
(x-1)²=400
x-1=±20
x=21或-19

21

没答案