(x-1)²+(x+3)(x-3)＋(x-3)(x-1),其中x²-2x＝2.先化简再求值,

(x-1)²+(x+3)(x-3)＋(x-3)(x-1),其中x²-2x＝2.先化简再求值,
(x-1)²+(x+3)(x-3)＋(x-3)(x-1),其中x²-2x＝2.先化简再求值,

(x-1)²+(x+3)(x-3)＋(x-3)(x-1),其中x²-2x＝2.先化简再求值,
2(x-1)^2-（x+3)(x-3)-(x-3)(x-1),
=2(x-1)^2-(x-3)(x-1)-（x+3)(x-3),
=(x-1)[2(x-1)-(x-3)]-（x+3)(x-3)
=(x-1)[2x-2-x+3]-（x+3)(x-3)
=(x-1)(x+1)-（x+3)(x-3)
=x^2-1-(x^2-9)
=x^2-1-x^2+9
=8
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