Đáp án: (x-1)^2-25=0
(x-1)^2=25
|x-1|=5
TH1: x-1=5
x=6
TH2: x-1= -5
x=-4
Ptrinh tương đương vs
(x−1)2=52
Vạy x−1=5 hoặc x−1=−5. Do đó x=6 hoặc x=−4.
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