(x-1)(x-3)-(x-1)的平方=?

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(x-1)(x-3)-(x-1)的平方=?
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(x-1)(x-3)-(x-1)的平方=?
(x-1)(x-3)-(x-1)的平方=?

(x-1)(x-3)-(x-1)的平方=?
(x-1)(x-3)-(x-1)的平方
=x^2-3x-x+3-(x^2-2x+1)
=x^2-4x+3-x^2+2x-1
=-2x+2