计算:(x-2)(x+1)+2
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计算:(x-2)(x+1)+2计算:(x-2)(x+1)+2计算:(x-2)(x+1)+2(x-2)(x+1)+2=x²-x-2+2=x²-x
计算:(x-2)(x+1)+2
计算:(x-2)(x+1)+2
计算:(x-2)(x+1)+2
(x-2)(x+1)+2
=x²-x-2+2
=x²-x
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