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(x-1)^2-10(x-1)+25=0
(2)x^2-20-21=0
人气:324 ℃ 时间:2020-02-06 03:34:44
解答
(x-1)^2-10(x-1)+25=0
[(x-1)-5]²=0
(x-6)²=0
x1=x2=6
(2)x^2-20x-21=0
(x-21)(x+1)=0
x1=21,x2=-1
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