计算 (x^2-2x+3)(x-1)(x+1)要过程
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计算 (x^2-2x+3)(x-1)(x+1)要过程
计算 (x^2-2x+3)(x-1)(x+1)要过程
计算 (x^2-2x+3)(x-1)(x+1)要过程
=(x^2-2x+3)(x^2-1)
=x^2(x^2-2x+3)-(x^2-2x+3)
=x^4-2x^3+3x^2-x^2+2x-3
=x^4-2x^3+2x^2+2x-3
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