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数学
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怎么解(x-1)的平方等于X
人气:467 ℃ 时间:2020-03-19 11:27:50
解答
(x-1)^2=x
x^2-2x+1-x=0
x^2-3x+1=0
a=1,b=-3,c=1
b^2-4ac=9-4=5
x=(3±√5)/2
x1=(3+√5)/2,x2=(3-√5)/2
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