快...數學問題

我用(x-1)^2代替你的(x-1)`2
先Factorize

(x-1)^2 = (x-1)(1-2x)
(x-1)(x-1) = (x-1)(1-2x)
x^2 - 2x + 1 = x - 2x^2 + 2x - 1
3x^2 - 5x + 2 = 0
(3x - 2)(x - 1) = 0

x = 2/3 or x = 1

注意在第二個step
唔好cancel (x-1)
因為會令答案少左個

x-1)`2


2 前面一點即係點解呀~~