(x-5)的平方-8(x-5)+16=0

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(x-5)的平方-8(x-5)+16=0(x-5)的平方-8(x-5)+16=0(x-5)的平方-8(x-5)+16=0(x-5)的平方-8(x-5)+16=0(x-5-4)²=0(x-9)

(x-5)的平方-8(x-5)+16=0
(x-5)的平方-8(x-5)+16=0

(x-5)的平方-8(x-5)+16=0
(x-5)的平方-8(x-5)+16=0
(x-5-4)²=0
(x-9)²=0
x=9