摘要：化简x-(1-2x+x2)+(-1+3x-x2)所得结果是 A.2x-2 B.-2x2+6x-2 C.2x D.2x2-6x+2 答案:B 提示:去括号.合并同类项.x-1+2x-x2-1+3x-x2=-2x2+6x-2.

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